Effects of free-air CO2 enrichment on heat-induced sterility and pollination in rice
Effects of free-air CO2 enrichment on heat-induced sterility and pollination in rice
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DOI：
10.1080/1343943x.2018.1563496
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发表时间：
2019-07-03
影响因子：
2.5
通讯作者：
Hasegawa, Toshihiro
中科院分区：
文献类型：
--
作者：
Kobayasi, Kazuhiro;Eydi, Mohammad Jawid;Hasegawa, Toshihiro
全球气候变化可能导致水稻热致不育，威胁这一重要作物的全球产量。虽然目前对大气CO2浓度（[CO2]）和温度对热诱导不育的综合影响知之甚少，但升高的[CO2]（E-[CO2]）可能会增加穗温，从而加剧热诱导不育，但这并未在开放田间进行测试。因此，我们研究了E-[CO2]对水稻热诱导不育和不育相关性状的影响，通过使用自由空气CO2富集（FACE）设施在6个生长季节中使用不同的生长季节温度将E-[CO2]增加约200 μ molmol（-1）高于环境水平。在每个开花日的09：00和12：00之间，育性百分比与空气温度（T-a）没有显著相关性，但它确实在不同年份之间存在显著差异，2011年经历了凉爽的温度，导致低温诱导的轻度不育。当去除2011年的数据时，在E-[CO2]下每个开花日的09：00和12：00之间，育性和T-a之间存在显著的负相关，而在环境[CO2]下没有看到这种影响。E-[CO2]还使沉积在柱头上的花粉粒数量明显减少10%，但使花粉囊长度略有增加1.3%，表明它对热致不育既有负面影响，又有正面影响。这些结果表明，E-[CO2]影响许多与热诱导不育相关的性状，有时可能通过减少花粉粒沉积而加剧不育。缩写：A-[CO2]：环境CO2; [CO2]：二氧化碳浓度; E-[CO2]：升高的[CO2]; FACE：自由空气CO2富集; T-a：空气温度
Global climate changes may cause heat-induced sterility in rice, threatening the global production of this important crop. Although little is currently known about the combined effects of the concentration of atmospheric CO2 ([CO2]) and temperature on heat-induced sterility, elevated [CO2] (E-[CO2]) will likely increase the panicle temperature and thereby exacerbate heat-induced sterility, but this was not tested in open fields. Therefore, we investigated the effect of E-[CO2] on heat-induced sterility and sterility-related traits in rice by increasing E-[CO2] by approximately 200 mu molmol(-1) above ambient levels using a free-air CO2 enrichment (FACE) facility for six growing seasons with variable growing season temperatures. The percentage fertility was not significantly correlated with the air temperature (T-a) between 09:00 and 12:00 on each flowering day, but it did significantly vary among the years, with 2011 experiencing cool temperatures resulting in chilling-induced mild sterility. When data from 2011 were removed, there was a significant negative correlation between fertility and T-a between 09:00 and 12:00 on each flowering day under E-[CO2], whereas no such effect was seen under ambient [CO2]. E-[CO2] also significantly reduced the number of pollen grains deposited on the stigma by 10%, but it slightly increased the anther length by 1.3%, indicating that it had both negative and positive effects on heat-induced sterility. These findings suggest that E-[CO2] affects many traits related to heat-induced sterility and may sometimes exacerbate sterility by reducing pollen grain deposition.Abbreviations:A-[CO2]: ambient CO2; [CO2]: the concentration of carbon dioxide; E-[CO2]: elevated [CO2]; FACE: free-air CO2 enrichment; T-a: air temperature