Effect of Heat Stress on Photosynthetic Characteristics of Different Green Organs of Winter Wheat During Grain-filling Stage  

灌浆期热胁迫对小麦不同绿色器官光合性能的影响(英文)

作　　者：徐晓玲[1] 王志敏[1] 张俊平[1] 

机构地区：[1]中国农业大学作物学院,北京100094

出　　处：《Acta Botanica Sinica》2001年第6期571-577,共7页Acta Botanica Sinica（植物学报：英文版）

基　　金：SupportedbytheStateKeyBasicResearchandDevelopmentPlan (G19980 10 10 0 ) .

摘　　要：Four winter wheat (Triticum aestivum L.) varieties ('JD 8', 'Jing 411','Centurk' and 'Tam 202') were used to study the effect of heat stress on photosynthetic characteristics of flag leaf blade, nag leaf sheath, peduncle, glume, lemma and awn during grain-filling stage. The results showed that heat acclimation during grain-filling stage increased thermotolerance of wheat with significant differences among different green organs. During heat stress, the decreases of the efficiency of primary light energy conversion (F-v/F-m) of PS II and pigment (chlorophyll and carotenoid) content were much slower in peduncle, flag leaf sheath and glume than in nag leaf blade, lemma and ann; and the percentage of decrease in net photosynthetic rate (P-n) of ear was lower than that of the nag leaf blade. The measured photosynthetic parameters (F-v/F-m, P-n and pigment content) of 'JD 8', a relatively heat tolerant variety, declined more slowly than those of the other three varieties during the whole heat stress period.以 4个冬小麦 (TriticumaestivumL .)品种 (“JD 8”、“Jing 411”、“Centurk”和“Tam 2 0 2”)为材料 ,研究灌浆期热胁迫对旗叶叶片、旗叶鞘、穗下节间、护颖、外颖和芒的光合性能和籽粒产量的影响。结果表明 :灌浆期对小麦进行热锻炼也能增加其耐热性且各绿色器官间耐热性差异显著。耐热性较强的器官为穗下节间、旗叶鞘和护颖 ;热敏感器官为旗叶叶片、外颖和芒。热胁迫条件下 ,穗下节间、旗叶鞘和护颖的细胞膜热稳定性强 ,光系统Ⅱ原初光能转换效率 (Fv/Fm)下降速率以及叶绿素和类胡萝卜素降解速率均低于旗叶叶片、外颖和芒 ,穗的净光合速率下降幅度小于旗叶。热胁迫过程中 ,相对耐热品种“JD 8”各器官上述光合参数的下降速率均显著低于其他 3个热敏感品种。

关 键 词：winter wheat net photosynthetic rate chlorophyll fluorescence kinetics parameters heat tolerance 

分 类 号：Q945.11[生物学—植物学]