高温胁迫对小黑麦光合作用影响  

Effects of high temperature stress on hexaploid triticale (x Triticosecale Wittmack) photosynthesis

作　　者：凌悦铭 张亚黎[1] 王震 任丽彤[2] 艾尼瓦尔[1] 李召锋[1] 孔广超[1] LING Yuemimg;ZHANG Yali;WANG Zhen;REN Litong;AINIWAER Jiang;LI Zhaofeng;KONG Guangchao(Agricultural College of Shihezi University/The Key Laboratory of Oasis Eco-agriculture,Xinjiang Production and Construction Corps,Shihezi,Xinjiang 832003,China;School of Chemistry and Chemical Engineering of Shihezi University,Shihezi,Xinjiang 832003,China)

机构地区：[1]石河子大学农学院/新疆生产建设兵团绿洲生态农业重点实验室,新疆石河子832003 [2]石河子大学化学化工学院,新疆石河子832003

出　　处：《石河子大学学报（自然科学版）》2020年第2期172-178,共7页Journal of Shihezi University(Natural Science)

基　　金：国家自然基金(31860376);农业部“948”计划项目(2013-Z75)。

摘　　要：为了解高温胁迫对小黑麦叶片光合作用的影响,探索高温胁迫下小黑麦应激机制,以4个六倍体小黑麦品种(系)为材料,在籽粒灌浆早期进行高温胁迫,测定了高温胁迫下旗叶光合作用指标的变化。结果表明,高温胁迫导致4个小黑麦品种的旗叶净光合速率(Pn)下降了11. 4%~39. 8%、胞间CO2浓度(Ci)上升了2. 0%~6. 8%、蒸腾速率(Tr)下降了1. 1%~26. 2%、气孔导度(Gs)变化不显著。在胁迫结束后10 d,经高温胁迫后的4个小黑麦品种旗叶的Pn仍显著低于对照、Tr多显著下降;品种新小黑麦3号、新小黑麦4号经高温胁迫后的Gs仍显著低于对照同时Ci下降,而品种扩繁1号、新小黑麦5号经高温胁迫后的Gs较对照变化不显著而Ci较对照极显著上升。参试小黑麦品种中新小黑麦3号耐热性较强,新小黑麦5号、新小黑麦4号次之,扩繁1号最弱;新小黑麦4号对损伤修复能力较强,新小黑麦3号、扩繁1号次之,新小黑麦5号最弱。综上,高温胁迫下小黑麦净光合速率下降主要受到非气孔因素影响,而且高温胁迫对光合机构造成的损伤是不可逆转,同时参试的4个小黑麦品种(系)间在耐热性和对高温损伤修复的性能间也存在差异,本研究为理解高温胁迫对六倍体小黑麦的影响机制提供了参考。The objective of this study is to understand the leave photosynthesis change mechanism for triticale under high temperatures stress.The photosynthesis indicators of four hexaploid triticale varieties were investigated under heat stress at early stage of grain filling.The results indicated that the net photosynthetic rate(Pn) decreased 11. 4% ~ 39. 8%,intercellular CO2 concentration(Ci) increased 2. 0% ~ 6. 8%,transpiration rate(Tr) decreased 1. 1% ~ 26. 2% and stomata conductance(Gs) did not change significantly.After 10 days’ recovery after the stress,four triticale varieties` flag leaf Pnwas still significantly lower than that of the control and Tr significantly decreased;Gsof XXHM3 and XXHM4 was still significantly lower than that of the control and Cidecreased,Gsof KF1 and XXHM5 did not change significantly and Ciincreased significantly than that of the control.Based on these results,XXHM3 had the strongest heat resistance and KF1 had the weakest heat resistance among the tested four triticale varieties.And XXHM4 had a strongest ability of damage repair and XXHM5 had the weakest.In conclusion,the decrease of net photosynthetic rate of triticale under high temperature stress is mainly affected by non-stomata factors,and the damage of photosynthetic mechanism caused by high temperature stress is irreversible.At the same time,heat resistance is different among triticale varieties( lines) and the triticale varieties repair ability after high temperature stress is different among triticale varieties. This study provides a reference for understanding the photosynthesis mechanism of triticale under high temperature stress.

关 键 词：小黑麦 高温胁迫 光合作用 

分 类 号：S512.1[农业科学—作物学] S311