Nonstructural carbohydrate content in the stubble per unit area regulates grain yield of the second crop in rice ratooning
Nonstructural carbohydrate content in the stubble per unit area regulates grain yield of the second crop in rice ratooning
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DOI：
10.1002/csc2.20764
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发表时间：
2022-06
期刊：
影响因子：
2.3
通讯作者：
H. Nakano;Ryo Tanaka;M. Hakata
中科院分区：
文献类型：
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作者：
H. Nakano;Ryo Tanaka;M. Hakata
水稻（Oryza sativaL.）再生由于其较高的产量潜力而受到关注。在本研究中，2019年和2020年在日本西南部使用两种水稻基因型（近等基因系（NIL）-GN 1ATakanari和Koshihikari）进行了水稻再生的田间试验，以获得单位面积残茬非结构性碳水化合物（NSC）浓度和/或含量对第二季作物产量的作用的直接证据，并确定产生更多小穗的基因的有效性。NIL-GN 1A高纳里是一个近等基因系，携带着一个GN 1A等位基因，GN 1A是一个在粳稻品种越光遗传背景下从高纳里衍生的调节单位面积小穗数的基因，它可以比越光产生更多的小穗。NIL-GN 1ATTakanari在这两年的第一季产量都没有高于越光，因为NIL-GN 1ATTakanari的小穗数m-2较多，但实粒数较少，粒重较低。NIL-GN 1ATTakanari的第二季产量比越光低，因为NIL-GN 1ATTakanari由于穗数较少而具有较少的小穗m-2。此外，由于2019年茬中叶鞘和茎重较低，NIL-GN 1ATTakanari的NSC含量低于Koshihikari。因此，NIL-GN 1ATTakanari第二季的较低籽粒产量可能是由于残茬中较低的NSC含量。此外，在残茬中NSC含量低的条件下，再生作物中NIL-GN 1ATakanari每单位面积产生更多小穗的能力没有得到证明。
Rice (Oryza sativaL.) ratooning has attracted attention due to its higher yield potential. In the present study, a field experiment on rice ratooning using two rice genotypes, near isogenic line (NIL)‐GN1ATakanariand Koshihikari, was conducted in 2019 and 2020 in southwestern Japan to obtain direct evidence for the role of stubble nonstructural carbohydrate (NSC) concentration and/or content per unit area on grain yield of the second crop and to determine the effectiveness of a gene producing more spikelets. NIL‐GN1ATakanariis a near isogenic line carrying an allele ofGN1A, which is a gene regulating the number of spikelets per unit area derived from anindicacultivar Takanari in the genetic background of ajaponicacultivar Koshihikari, and it can produce more spikelets than Koshihikari. NIL‐GN1ATakanaridid not produce a higher grain yield of the first crop than Koshihikari in both years because NIL‐GN1ATakanarihad more spikelets m−2but fewer filled spikelets and a lower grain weight. NIL‐GN1ATakanariproduced a lower grain yield of the second crop than Koshihikari because NIL‐GN1ATakanarihad fewer spikelets m−2due to the fewer panicles. Also, NIL‐GN1ATakanarihad a lower NSC content than Koshihikari due to the lower leaf sheath plus stem weight in the stubble in 2019. Thus, the lower grain yield in the second crop of NIL‐GN1ATakanarimay result from the lower NSC content in the stubble. Additionally, the ability to produce more spikelets per unit area of NIL‐GN1ATakanariwas not demonstrated in ratoon crop under the condition of low NSC content in the stubble.