Wheat plants exposed to winter warming are more susceptible to low temperature stress in the spring
Wheat plants exposed to winter warming are more susceptible to low temperature stress in the spring
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DOI：
10.1007/s10725-015-0029-y
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发表时间：
2015-09-01
影响因子：
4.2
通讯作者：
Jiang, Dong
中科院分区：
文献类型：
--
作者：
Li, Xiangnan;Cai, Jian;Jiang, Dong
冬季变暖是全球气候变化的一个主要后果，它可能会影响冬季作物的冷驯化，从而降低其对春季低温胁迫的耐受性。在这项研究中，冬小麦植物暴露于冬季变暖，即，从2010年12月7日至2011年1月11日，将气温升高2.89 A ℃ 35天，然后进行5天的低温胁迫，即，8.44 2011年4月8日至12日，比环境温度低A ℃。在整个季节中在环境温度下生长的植物作为对照。与对照相比，春季低温胁迫和冬暖+春季低温胁迫显著降低了植株的生长。经历冬季变暖的植物，由于叶绿体和线粒体中SOD、APX和CAT活性下降，氧清除能力下降，导致活性氧胁迫过度积累。这对PS Ⅱ的电子传递（ETO/RC）、捕获效率（TRo/RC）和PSI受体产生不利影响，导致春季低温胁迫下光合速率降低。说明暖冬小麦在春季更易受到低温胁迫的影响。
Winter warming is a main consequence of global climate change, which may influence cold acclimation of winter crops hereby reducing their tolerance to low temperature stress in the spring. In this study, winter wheat plants were exposed to winter warming, i.e., increasing air temperature by 2.89 A degrees C for 35 days (from 7th December 2010 to 11th January 2011), and then subjected to a 5-day low temperature stress, i.e., 8.44 A degrees C lower than the ambient temperature, from 8th to 12th April 2011. Plants grown under ambient temperature during the whole season served as control. Compared with the control plants, spring low temperature stress and the combination of winter warming and spring low temperature stress significantly decreased plant growth. The plants experienced winter warming possessed lower oxygen scavenging capacity due to the decreased activities of SOD, APX and CAT in chloroplasts and mitochondria, resulting in over accumulation of ROS stress. This adversely affected electron transport in PS II (ETo/RC), trapping efficiency (TRo/RC) and PSI acceptor in the photosynthetic apparatus, leading to lower photosynthetic rate during spring low temperature stress. It is concluded that wheat plants experienced warm winter are more susceptible to low temperature stress in the spring.