J Integr Plant Biol. ›› 2001, Vol. 43 ›› Issue (6): 571-577.

• Research Articles • Previous Articles     Next Articles

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

XU Xiao-Ling   

Abstract:

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, flag 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 ( Fv/Fm ) of PS and pigment (chlorophyll and carotenoid) content were much slower in peduncle, flag leaf sheath and glume than in flag leaf blade, lemma and awn; and the percentage of decrease in net photosynthetic rate ( Pn ) of ear was lower than that of the flag leaf blade. The measured photosynthetic parameters ( Fv/Fm , Pn 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. 

灌浆期热胁迫对小麦不同绿色器官光合性能的影响
徐晓玲* 王志敏 张俊平
(中国农业大学作物学院,北京100094)

摘要:以4个冬小麦(Triticum aestivum L.)品种(“JD 8”、“Jing 411”、“Centurk”和 “Tam 202”)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: 冬小麦;旗叶;净光合速率;叶绿素荧光动力学参数;耐热性

Key words: XU Xiao-Ling, WANG Zhi-Min, ZHANG Jun-Ping

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