
中圖分類號:S664.2 文獻標志碼:A 文章編號:1009-9980(2025)08-1786-11
Abstract: 【Objective】The production of Castanea henryi is anew industry in Guizhou province of China.Many native cultivars have been introduced from Fujian province in resent years.Their adaptability remains unclear. The study systematically evaluated the photosynthetic characteristics and chlorophyll fluorescence parameters of 8C. henryi native cultivars from Fujian in order to provide a scientific basis for the cultivation of C .henryi in Qiandongbei region of Guizhou province.【Methods】 This experiment was conducted in mid-July at the Woody Oil Crop Base of Tongren University (27°47′30′′N 109° (204號 13′16′′ E,altitude 466.2m ).The two-year-old grafted trees of 8 native cultivars of C? henryi introduced from Fujian were used as experimental materials. The density of the trees were 4m×4m in the plot under conventional irigation and fertilization management.The relative chlorophyll content (SPAD) was measured using a SPAD-502Plus chlorophyll meter. The leaf area, length,and width were then measured with a Li-30o0C portable leaf area meter. The photosynthetic parameters were measured between 08:30 and 11:30 on clear days using an Li-6800 portable photosynthesis system.The target leaves were marked and subsequently photoinduced at a light intensity of
for at least 20 minutes until stabilization of the net photosynthetic rate (Pn) . The light-response curves were fitted through a rectangular hyperbolic correction model, with parameters recorded including maximum net photosynpoint (LCP),and dark respiration rate (Rd) . The chlorophyll fluorescence analysis was conducted through overnight dark-adaptation of the leaves achieved by aluminum foil wrapping. With the Li-6800 system maintained at identical chamber settings to those used for light-response curve measurements, a 30-minute light adaptation was performed before parameter determination. The recorded parameters included: initial fluorescent light (F0) ; maximal fluorescence (Fm) , PS II primary light energy conversion efficiency (Fv/Fm) , potential efficiency of primary conversion of PS II (Fv/F0) ,actual photochemical efficiency of PS II (Fv′/Fm′) , photochemical quenching coefficient (qP) , electron transport rate (ETR), and non-photochemical quenching (NPQ). The Mantel test was applied to conduct correlation analysis for examining the relationships among growth parameters, photosynthetic parameters,and chlorophyll fluorescence parameters. The principal component analysis was applied to identify dominant characteristic parameters between photosynthetic parameters and chlorophyll fluorescence parameters. 【Results】 The significant growth variations were observed in the growth indexes of different native cultivars of C. henryi. Among all tested cultivars, Youzhen exhibited superior performance in plant height (96.18cm) ) ground diameter ( 20.79mm ),and leaf area (76.15cm2) ,all significantly higher than those of the other cultivars (
). The SPAD values of Youzhen and Dajianzui were significantly higher than those of the other cultivars ( (Plt;0.05 ).Although the 8 cultivars displayed similar trends in light-response curves, they differed significantly in the key photosynthetic parameters. The AQY ranged from 0.042 to 0.059, with Youzhen and Dajianzui exhibiting the highest values of O.059. The Pnmax of Bailuzi was significantly lower than that of other cultivars. Changmangzi exhibited the lowest Rd, while Heili had the highest Rd Meanwhile,Heili had the highest LCP and LSP.The significant variations in chlorophyll fluorescence parameters were observed among 8C. henryi cultivars.The initial fluorescent light (F0) of Bailuzi was significantly higher than that of other cultivars ( (Plt;0.05 ). The correlation analysis revealed that plant height had a highly significant and positive correlation (Plt;0.01 ) with ETR,AQY,LSP, CP, and Rd .The Pnmax was positively correlated with Fm. Fv/Fm Fv/F0, and Fv′/Fm′ , while it was negatively correlated with NPQ. Furthermore, the Fv/Fm,Fv/F0, and Fv′/Fm′ showed a highly significant and positive correlation (Plt;0.05 ). The chlorophyl fluorescence parameters of Youzhen and Dajianzui were similar, but the NPQ value of Dajianzui was significantly lower than that of Youzhen. Additionall, both Youzhen and Dajianzui showed relatively high values of the Fv′/Fm′ and ETR. The Fv′/Fm′ of Youzhen was 0.755 and the ETR was 114.677, while those of Dajianzui were 0.765 and 107.148,respectively. The Fv/ F0 of Youzhen was not significantly different from that of Chushuhong, but was significantly higher than that of the other 6 cultivars ( (Plt;0.05) ). The principal component analysis (PCA) grouped the 13 photosynthetic physiological characteristics into two principal components with a cumulative contribution rate of 77.48% ,among them, the first principal component was closely related to Fv/Fm,Fv/F0 ,and Fv′/Fm′ ,with a contribution rate of 53.72% ,while the second principal component was related to LSP and ETR,with a contribution rate of 23.76% . Based on the analysis of the data distribution related to the growth and physiological characteristics of C. henryi cultivars, Youzhen, Dajianzui,and Wukechangmang were closely clustered together in the data distribution pattern. In contrast, Heili and Bailuzi were located far away from the other six native cultivars in the same data distribution context.【Conclusion】 The significant variations in growth parameters and photosynthetic physiological characteristics were observed among different C .henryi native cultivars from Fujian. The Youzhen cultivar demonstrated superior growth performance and high light-use effciency,consistent with its growth parameter performance, indicating better adaptability in the Qiandongbei region of Guizhou province.
Key Words: Castanea henryi; Native cultivars; Growth indexes; Photosynthetic characteristics; Chlorophyll fluorescence; Correlation analysis
錐栗(Castaneahenryi)屬殼斗科(Fagaceae)栗屬(Castanea)植物,為中國特有種,是我國重要的木本糧食和“鐵桿莊稼”,野生種廣布于中國秦嶺南坡以南、五嶺以北各地,栽培種主要在閩北和浙南地區,近年來因其特殊的營養價值和經濟價值引起南方部分省份關注[12]。貴州省作為錐栗的新興產區,已形成顯著的地區發展差異。目前,貴州省錐栗產業尚處起步階段,主要栽植區域為銅仁市、黔東南州、黔南州和黔西南州等地區,栽培總面積 667hm2 以上,栽植品種均為從福建引進的錐栗農家品種(大白露、長芒仔、處暑紅和油榛等),適應性還有待驗證。
植物光合特性能夠反映植物的生長潛力與環境適應力[3-4]。光響應和葉綠素熒光參數作為植物的“內在探針”,可有效表征植物生理狀態、脅迫響應及光能利用效率等關鍵信息。目前,有關錐栗光合特性的研究主要集中于光合作用的限制因子及提高作物光合效率的途徑方面。王璐等研究表明, 8°C 低溫和 38°C 高溫脅迫均會導致錐栗幼苗光合作用減弱;李艷麗等發現錐栗嫁接苗對光的適應性和光合利用能力強于實生苗;范曉明等發現開心形錐栗樹體在光能利用效率方面優于自然圓頭形和小冠疏層形,有利于錐栗增產;劉智強等于錐栗初花期和盛花期分別噴施 0.30% 硼,發現可提高光合效率;王璐等發現砧木年齡越大,越有利于提高光合能力和光能利用效率。針對貴州地區引種錐栗光合特性方面的研究鮮有報道,導致引種工作存在較大盲目性,農家品種對生境適應性不足,嚴重制約了優質錐栗農家品種的篩選進程。因此,筆者通過測定8個黔東北地區引種錐栗農家品種的光合生理指標,分析其需光特性,以期為貴州省黔東北地區錐栗品種合理栽植和區域性試驗提供參考依據。
1 材料和方法
1.1 試驗地概況
試驗地位于貴州省銅仁市碧江區銅仁學院木本糧油試驗基地(北緯 27°47′30′′ ,東經 109°13′16\" ,海拔 466.2m) ,屬中亞熱帶季風濕潤氣候,年日照時數1044.7~1266.2h ,年平均氣溫 15.6°C ,年平均降水量 1260mm ,無霜期 290d ,土壤為酸性黃壤土。
1.2材料
供試材料為8個2年生錐栗農家品種嫁接樹,分別為油榛、大尖嘴、長芒仔、烏殼長芒、處暑紅、白露仔、大白露、黑栗,株行距 4m×4m ,生長健壯且長勢一致,常規土肥水管理。
1.3 方法
1.3.1生長指標測定采用卷尺測定株高,采用游標卡尺測定地徑,5株為1個小區,3次重復;選取每株樹冠上、中、下層各3片成熟向陽葉片并標記,采用SPAD-502Plus手持葉綠素儀測定葉綠素相對含量,測定部位為葉長1/2及葉寬1/4處(避開葉脈);采用Li-3000C葉面積儀測定葉面積、葉長、葉寬。
1.3.2光響應曲線測定采用Li-6800便攜式光合測定儀的LED紅藍光源葉室對標記葉片在1200μmol?m-2?s-1 光強下進行充分的光誘導后 (20min 以上直至 Pn 數值穩定)開始測定凈光合速率,3次重復。測定時間為:上午 08:30-11:30 。測定環境:氣溫約 36.5°C ,相對濕度(RH)設置為 60% ,葉室 CO2 的濃度設置為 400μmol?m-2?s-1 。流速(Flow)設置為
,風扇轉速 10 000r?min-1 。光合有效輻射梯度設定為: 1200,1000,800,600,400,200,100,
,每個葉片在每個光照度下適應 100~250s 。采用直角雙曲線的修正模型擬合Pn -PAR曲線],計算出最大凈光合速率 (Pnmax) 、光飽和點(LSP)、光補償點(LCP)、表觀量子效率(AQY)和暗呼吸速率 (Rd) 等光合參數。
1.3.3葉綠素熒光參數測定采用LI-6800便攜式光合測定儀對上述已標記的葉片進行測定,測定時間、葉室參數與測定光響應曲線的設定相同,測定前一晚用錫箔紙包裹葉片,充分暗適應,然后進行至少30min 的光適應。測定初始熒光 (F0) 、最大熒光(Fm) [],通過計算得到PSⅡI最大光化學量子效率(Fv/Fm) 、PSII潛在活性 (Fv/F0) 、實際光化學效率(Fv′/Fm′) 、光化學淬滅系數 (qP) 、電子傳遞速率(ETR)及非光化學淬滅系數(NPQ)[3]。
1.4 數據處理
使用Excel軟件對生長和光合特性參數進行數據整理和分析,使用SPASS27.0進行差異顯著性分析;采用Origin2024軟件繪制光響應曲線;光合參數和葉綠素熒光參數主成分分析用R4.4.1軟件的ade4包、vegan包、gclus包、missMDA包、FactoMineR包、ggplot2包、ggrepel包、ggthemes包、ggExtra包、clus-ter包繪制;生長特性和光合特性相關性分析用R4.4.1軟件的vegan包、dplyr包、devtools包、linkET包、ggplot2包、ggcor包繪制Manteltest圖。
2 結果與分析
2.18個錐栗農家品種幼樹生長特性比較
不同錐栗農家品種幼樹生長存在明顯差異(表1)。油榛的株高 (96.18cm, )、地徑 (20.79mm) 、葉面積 (76.15cm2) 、葉寬 (5.89cm 均顯著高于其他農家品種。處暑紅的葉長與大尖嘴、油榛差異不顯著,但顯著高于其他5個農家品種。油榛與大尖嘴的葉綠素相對含量顯著高于其他農家品種,分別為45.12和43.26 綜上所述,油榛的生長表現優于其他農家品種。
表1不同錐栗農家品種幼樹生長參數特征
Table1 Characterization of growth parameters for saplings of different C. henryi native cultivars

注:同列不同小寫字母表示差異顯著 (Plt;0.05 。下同。 Note:Different smalleters in the samecolumn indicate significant difference at 0.O5 level.The same blow.
2.28個不同錐栗農家品種幼樹光合-光響應特征比較
8個不同錐栗農家品種幼樹,所繪制的擬光合作用響應曲線表現出了相似的變化趨勢(圖1)。在低光合有效輻射時 (0~200μmol?m-2?s-1) ,凈光合速率隨著光合有效輻射(PAR)的增加而迅速升高,基本呈線性增長;當PAR高于 400μmol?m-2?s-1"時,白露仔出現光抑制現象而后趨于穩定,當 PARgt; 600μmol?m-2?s-1"時,長芒仔、大尖嘴和烏殼長芒的凈光合速率達到最大值 (Pnmax) ,隨著PAR的不斷升高隨后表現出光抑制現象,當 PARgt;800μmol?m-2?s-1"時,處暑紅和油榛達到 Pnmax",而后出現光抑制現象,當PARgt;1000μmol?m-2?s-1"時,黑栗和大白露達到 Pnmax"。
圖1不同錐栗農家品種幼樹光響應擬合曲線

Fig.1Fitted curves light response ofC.henryi saplingsof different nativecultivars
不同農家品種錐栗幼樹光響應特征參數存在顯著差異(表2)。油榛、大尖嘴和烏殼長芒的AQY顯著高于其他農家品種;白露仔的 Pnmax 最低,為2.582μmol?m-2?s-1 ,比最高的油榛( 12.525μmol?m-2?s-1) 2顯著降低 79.38% ;黑栗的LSP、LCP和 Rd 顯著高于其他7個農家品種,分別為 995.556μmol?m-2?s-1.127.425μmol?m-2?s-1 和 4.644μmol?m-2?s-1
2.38個不同錐栗農家品種幼樹葉綠素熒光參數比較
8個不同錐栗農家品種幼樹的葉綠素熒光參數存在顯著差異(表3)。白露仔的 F0 和NPQ均顯著高于其他農家品種,分別為287.796和0.949。油榛的Fm 最高,為1374.700,比最低的白露仔(887.915)顯著提高 54.82% 。不同農家品種 Fv/Fm 在0.75~0.85范圍內(除白露仔外),白露仔的 Fv/Fm 最低,為0.668,其他農家品種 Fv/Fm 均顯著高于白露仔。此外,油榛與處暑紅的 Fv/F0 差異不顯著,但油榛顯著高于其他6個農家品種,其中白露仔最低,為2.039。黑栗的qP最高,為0.899,白露仔的 qP 最低,為0.624;油榛與大尖嘴的ETR差異不顯著,但油榛顯著高于其他6個農家品種,且最低的白露仔(53.636)較最高的油榛(114.677)顯著降低 53.23% 。
表2不同錐栗農家品種幼樹的光響應特征參數Table 2Characteristics parameters of light responsecurves for saplings of diferent C.henryi native cultivars

表3不同錐栗農家品種幼樹葉綠素熒光參數
Table3Chlorophyl fluorescence parameters for saplings of diferent C. henryi native cultivars

2.48個錐栗農家品種幼樹生長指標和光合生理指標相關性分析
光響應參數與葉綠素熒光參數之間存在不同程度的相關性(圖2)。 Pnmax 與 FmΩΩΩΩFv/FmΩΩΩΩΩFv/F0 和 Fv′/Fm′ 呈極顯著正相關; Rd 與LSP、LCP、 qP 和 Fv′/Fm′ 呈極顯著正相關,與 FmΩ,Fv/Fm 和 Fv/F0 呈顯著正相關。LSP與Pnmax 呈極顯著正相關,與
和 qP 呈顯著正相關。 Fv/Fm,Fv/F0 與 Fv′/Fm′ 三者間呈極顯著正相關; qP 與 Fm,Fv/Fm 和 Fv/F0 呈顯著正相關,與 Fv′/Fm′ 呈極顯著正相關;NPQ與 Fv′/Fm′ 和 qP 呈極顯著負相關。
生長參數與光合生理特性參數之間也存在不同程度的相關性(圖2)。株高與ETR、AQY、LSP、LCP和 Rd 呈極顯著正相關;地徑與 Fm,Fv/Fm,Fv/F0,Fv′/ Fm′、qP 、NPQ、ETR、AQY和 Pnmax 呈極顯著正相關;葉面積與 Fm,Fv/F0 、ETR和 Pnmax 呈極顯著正相關,與 Fv/ FmΩ,Fv'/Fm′ 、NPQ和AQY呈顯著正相關;葉長與 Fv/ $F _ { \mathrm { m } } \Lt F _ { \mathrm { v } } / F _ { \mathrm { 0 } } \Lt F _ { \mathrm { v } } ^ { \mathrm { ~ \prime ~ } } / F _ { \mathrm { m } } ^ { \mathrm { ~ \prime ~ } }$ 和ETR呈極顯著正相關,與 Fm?qP 、NPQ和 Pnmax 呈顯著正相關;SPAD與 FmΩΩΩΩFv/FmΩΩΩΩFv/F0 、Fv′/Fm′ 、NPQ、ETR、AQY和 Pnmax 呈極顯著正相關,與qP 呈顯著正相關。
2.58個錐栗農家品種幼樹光合生理指標主成分分析
通過對8個農家錐栗品種幼樹的光合生理指標進行主成分分析(PCA),以特征值大于1為標準,選取了2個主成分進行研究(圖3)。結果表明,前兩個主成分總共解釋了 77% 以上的變異。其中,第1主成分解釋了 53.72% 的變異, Fv/Fm,Fv/F0 和 Fv′/Fm′ 的貢獻較大;第2主成分解釋了 23.73% 的變異,LSP和ETR貢獻較大。PCA分析表明,黑栗和白露仔與其
Mantel's r 代表光合生理特性矩陣和生長指標矩陣相關性,Mantel's P 代表光合生理特性矩陣和生長指標矩陣相關性的顯著性,SpearmanS r 是指光合生理特性之間的相關性。*和**分別表示在 Plt;0.05 和 Plt;0.01 水平的相關性顯著和極顯著。
圖2不同錐栗農家品種幼樹生長指標和光合生理指標的相關性分析

Mantel's r represents thecorrelationbetweenphotosyntheticphysiologicalcharacteristicsmatrixandgrowth indexes matrix,Mantel’s P representthesigaftelaieotosicilalractestsatridestrida' r refers to the correlation between photosynthetic physiological characteristics.*and ** indicate significant and highly significant correlations at the Plt; 0.05and Plt;0.01 level.
Fig.2Correlation analysis of growth indexes and photosynthetic physiological indexes in saplings ofdifferentC.henryinativecultivars
上側的山脊圖展示了在PC1方向上的數據密度分布,右側的山脊圖則展示了在 PC2方向上的數據密度分布。X1~X13 分別代表 F0?Fm?Fv/ F0LVv/FmLVv/FmL′LΩLqP 、NPQ、ETR、AQY ?Pnmax 、LCP、LSP和 Rd°
圖3不同錐栗農家品種幼樹光合生理指標主成分分析

TheridgelotoeeidsplastsitstrbtiootaogthCieioiletdeotohightsidspste densitydistributionof dataalong thePC2 direction. X1 to X13 represents F0,Fm,Fv/F0,Fv/Fm,Fv′/Fm 0 qP, NPQ,ETR,AQY, Pnmax ,LCP, Rd, respectively.
Fig.3PrincipalcomponentanalysisofphotosyntheticphysiologicalindexesinsaplingsofdiferentC.henryinativecultivars
他6個品種相距較遠,光合生理特性存在明顯差異。油榛、大尖嘴和烏殼長芒相距較近,光合生理特性存在一定相似性。黑栗和長芒仔在PC1上數據分布較為集中,大白露在PC2上數據分布較為集中。
3討論
光合-光響應反映了植物對光的利用程度和內部的生理狀態,由其擬合得到的光合參數闡明了植物利用光能資源的能力,對研究植物光合機制具有重要意義。 Pnmax 是探究植物光合潛能的重要參數,反映植物葉片的最大光合能力,本研究中錐栗農家品種 Pnmax 范圍為 2.582~12.525μmol?m-2?s-1. 其中油榛
能夠表現出較強的光合性能,與宗思潔[4研究結果相似。AQY、LCP和 Rd 均反映植物對弱光的利用能力[15]。表觀量子效率(AQY)是反映植物光能利用效率的指標,一般植物在適宜生長環境下的AQY為 0.03~0.05[16] ,AQY值越高,表明在自然弱光環境下捕獲光合作用光子的能力越強。本研究中,各錐栗農家品種AQY為 0.042~ 0.059,略小于張麗的研究結果 (0.047~0.066) ,可能與品種有關。LCP和LSP是反映植物對強弱光利用能力的重要指標[1]。LCP代表植物凈光合速率與其呼吸消耗相等時的光照度閾值。較低的LCP標志著植物即便在微弱的光照環境下,也能有效地維持光合作用與呼吸作用間的動態平衡[20]。本研究中長芒仔的LCP最低
,表明其利用弱光能力相對較強,適合在光強較弱的環境下生長。LSP則表示植物利用強光的能力,黑栗的LSP最高 (995.556μmol?m°2?s-1) ,表明黑栗在強光條件下具有更強的光合作用能力,適合在光照較強的環境下生長。 Rd 反映了植物在黑暗條件下的呼吸作用強度, Rd 越低,生理活動所消耗的物質能量越小,積累干物質的能力越強[2]。本研究中長芒仔的 Rd 最低,為 1.322μmol?m-2?s-1 ,表明其干物質積累最多,黑栗的 Rd 最高,為 4.644μmol?m-2?s-1 ,表明其生理活動需要消耗更多的光合產物,可能會導致生長效率降低。在本研究中,大尖嘴和油榛光響應特征大體相似(除 Pnmax 和LSP),大尖嘴的 Pnmax(7.921μmol?m-2?s-1) 和LSP
比油榛的 Pnmax ( 12.525μmol?m-2?s-1) 和 LSP(750.659μmol?m-2?s-1) 低,推測大尖嘴可能更適合海拔較低的地區栽培,該結論還有待進一步驗證。
葉綠素熒光參數可以在一定程度上反映光合作用機制中一系列重要的調控過程[221,不同物種在不同光環境下的葉綠素熒光存在顯著差異。通過深入研究植物葉片葉綠素熒光特性,揭示植物的光化學反應活性及其自我防護機制,對農家品種的選擇和篩選具有重要意義。 F0 表示PSⅡ反應中心處于完全開放時的熒光產量[23], F0 越高,說明植物對光能的利用效率越低,反之則越高[24,而白露仔具有最高的F0 ,表明其對光能利用效率最低。 Fv/Fm 的顯著變化常被用作應激的指標[25], Fv/Fm 是指PSII原初光能轉化效率,在適宜條件下處于 0.75~0.85 之間[。已有研究表明, Fv/Fm 不受物種的影響,非脅迫條件下,該參數的變化極小;在本試驗中,各錐栗農家品種(除白露仔外)的 Fv/Fm 均處于 0.75~0.85 ,表明白露仔受到環境脅迫的影響明顯,這與實際觀測一致,生產中白露仔適合栽培在海拔 1000m 以上的地區。實際光化學效率
和電子傳遞速率(ETR)均能反映植物的光合作用能力,可作為植物葉片光合作用電子傳遞速率快慢的相對指標[28]。 Fv′/Fm′ 反映了光適應條件下PSⅡI的有效光化學量子產量,表示在光下PSⅡI反應中心部分開放時的光化學效率[29],ETR則表示葉片的電子傳遞速率[3,ETR越高,表明葉片具有越強的光合電子傳遞能力,油榛、大尖嘴的Fv′/Fm′ 和ETR相對較高,表明其能夠為光合碳同化提供更多的NADPH和ATP,更利于形成可供植物生長利用的光合產能。非光化學熒光淬滅系數(NPQ)是代表光保護的重要指標,反映植物將消耗過剩光能轉化為熱能的能力[31]。在本研究中,油榛和大尖嘴葉綠素熒光參數相似,但大尖嘴的NPQ(0.213)明顯低于油榛(0.537),說明大尖嘴更適合較低海拔地區,而油榛具有良好的光保護機制,更適合較高海拔地區,與光響應的研究結果一致。白露仔 Fv/Fm 較低,NPQ較高,受到一定程度的環境脅迫,具體原因及內在機制有待進一步深入研究。
生長指標與光合特性之間存在密切的關系[32-34]。本研究中,葉面積和葉長與ETR呈極顯著正相關,與NPQ呈顯著正相關,這與徐薪璐等[5等的研究結果相似。SPAD與 $F _ { \mathrm { m } } \Lt F _ { \mathrm { v } } / F _ { \mathrm { m } } \Lt F _ { \mathrm { v } } / F _ { 0 } \Lt F _ { \mathrm { v } } ^ { \prime } / F _ { \mathrm { m } } ^ { \prime }$ Pnmax 呈極顯著正相關,與李丹等的研究結果相似,推測葉綠素相對含量可能在評估植物光合性能時具有重要作用。值得注意的是,目前已有研究表明,幼樹的生長指標與光合特性的關聯性能夠反映成齡樹的基礎特征。幼樹與幼苗光合特性變化趨勢相似,樹齡差異主要體現在參數絕對值而非變化趨勢上,進一步證實了幼齡樹生長特性與光合生理特性指標對成齡樹適應性的預測價值。葉綠素熒光與光合作用各反應環節緊密相關,逆境對光合作用的影響可通過葉綠素熒光誘導動力學變化反映出來[39]。在本研究中, Pnmax 與 FmΩ,Fv/Fm,Fv/F0 和 Fv′/Fm′ 呈極顯著正相關。目前,已在黑麥草[4]、水稻、濟菊中發現在非生物脅迫下, Pnmax 的降低可以通過葉綠素熒光參數 Fv/Fm?Fv′/Fm′ 和NPQ反映出來 (Fv/ Fm 和 Fv′/Fm′ 降低,而NPQ呈上升趨勢)[43]。此外,LSP、LCP以及 Rd 與葉綠素熒光參數相關性和 Pnmax 大體一致。同樣 Fv/Fm.Fv/F0 以及 Fv′/Fm′ 之間彼此呈極顯著正相關,與 qP 和ETR呈顯著正相關,與NPQ呈負相關。這與在非生物脅迫下朱槿[4、芹菜4]、青萍[4和生物脅迫下茄子[47]、枸杞[4]試驗中具有相似的結論。綜上,本研究可為深入探究錐栗在脅迫環境下的光合生理狀態提供一定的參考依據。
4結論
通過對8個不同錐栗農家品種幼樹生長、光合和葉綠素熒光參數進行比較及相關性分析,初步推斷出油榛相比其他7個錐栗農家品種生長發育良好,光能利用率高,在貴州省黔東北地區有較強的適應性。
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