Ozone-Induced Rice Grain Yield Loss Is Triggered via a Change in Panicle Morphology That Is Controlled by ABERRANT PANICLE ORGANIZATION 1 Gene.
Ozone-Induced Rice Grain Yield Loss Is Triggered via a Change in Panicle Morphology That Is Controlled by ABERRANT PANICLE ORGANIZATION 1 Gene.
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DOI：
10.1371/journal.pone.0123308
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Tamaoki M
中科院分区：
文献类型：
--
作者：
Tsukahara K;Sawada H;Kohno Y;Matsuura T;Mori IC;Terao T;Ioki M;Tamaoki M
由于对流层臭氧浓度增加，预计未来稻米产量将下降。然而，潜在的机制尚不清楚。研究了两个水稻品种Sasanishiki和Habataki对臭氧的响应。臭氧对Sasanishiki叶片造成损伤，但未造成产量损失。相比之下，Habataki表现出籽粒产量损失和最小的叶片伤害。在Sasanishiki/Habataki染色体片段代换系中发现了一个与臭氧造成的粮食产量损失相关的QTL，其中包括APO1基因。在一个近等基因系中，APO1位点的Habataki等位基因也导致臭氧暴露后的粮食产量损失，这表明APO1参与了臭氧诱导的产量损失。不同品种间APO1氨基酸序列差异不大，但臭氧暴露对APO1转录物水平有相反的调节作用，即Sasanishiki的APO1转录物水平升高，Habataki的APO1转录物水平降低。有趣的是，一些已知与臭氧诱导的叶片损伤衰减有关的植物激素（茉莉酸、茉莉酰基- l-异亮氨酸和脱落酸）的水平在暴露于臭氧后，Sasanishiki的水平趋于下降，而Habataki的水平趋于上升。这些数据表明，臭氧诱导的哈巴塔基地区的粮食产量损失是由APO1转录物水平的降低引起的，而APO1转录物水平的降低是通过减少叶片损伤的植物激素水平的增加引起的。
Rice grain yield is predicted to decrease in the future because of an increase in tropospheric ozone concentration. However, the underlying mechanisms are unclear. Here, we investigated the responses to ozone of two rice (Oryza Sativa L.) cultivars, Sasanishiki and Habataki. Sasanishiki showed ozone-induced leaf injury, but no grain yield loss. By contrast, Habataki showed grain yield loss with minimal leaf injury. A QTL associated with grain yield loss caused by ozone was identified in Sasanishiki/Habataki chromosome segment substitution lines and included the ABERRANT PANICLE ORGANIZATION 1 (APO1) gene. The Habataki allele of the APO1 locus in a near-isogenic line also resulted in grain yield loss upon ozone exposure, suggesting APO1 involvement in ozone-induced yield loss. Only a few differences in the APO1 amino acid sequences were detected between the cultivars, but the APO1 transcript level was oppositely regulated by ozone exposure: i.e., it increased in Sasanishiki and decreased in Habataki. Interestingly, the levels of some phytohormones (jasmonic acid, jasmonoyl-L-isoleucine, and abscisic acid) known to be involved in attenuation of ozone-induced leaf injury tended to decrease in Sasanishiki but to increase in Habataki upon ozone exposure. These data indicate that ozone-induced grain yield loss in Habataki is caused by a reduction in the APO1 transcript level through an increase in the levels of phytohormones that reduce leaf damage.
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