Limited yield advantage of early-season rice hybrids over inbreds in middle-lower reaches of the Yangtze River
Limited yield advantage of early-season rice hybrids over inbreds in middle-lower reaches of the Yangtze River
复制标题
长江中下游早稻杂交种较自交系产量优势有限
DOI：
10.1007/s11032-019-1018-z
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发表时间：
2019-07
影响因子：
3.1
通讯作者：
Ma Liang-Yong
中科院分区：
文献类型：
--
作者：
Chen Jun-Yu;Du Cheng-Xing;Zhang Hua-Li;Dai Dong-Qing;Wu Ming-Yue;Ma Liang-Yong
早稻是我国双季稻生产中提高粮食单产的重要作物。但近年来，长江中下游地区，特别是南方稻区国家水稻区域适应性试验中，早稻品种的产量增长出现停滞。此外，在早季，杂交水稻并不总是表现出优于自交水稻的粮食生产。早籼稻在种质资源开发取得新的突破之前，是否已经达到产量上限是一个值得商榷的问题。2017年和2018年在中国杭州进行了田间试验，以评估5个自交系及其衍生的12个杂交水稻品种的产量表现。观察到早季杂交种相对于自交系的产量优势有限，通常小于5.00%，2017年平均为0.62%，2018年为3.20%。与自交系相比，杂交种在生育期相近的条件下，单株穗数多，穗粒数少。利用筛选出的48个分子标记对杂种亲本间的遗传距离进行了测定，结果表明，杂种亲本间的遗传距离较低。此外，它们的基因型的4个关键数量性状位点的产量性状和抽穗期和3个只对产量性状。60个主要早籼品种在4个多效性位点上也表现出相同的结果。结果表明，供试材料的单倍型组合高度一致，这可能导致抽穗早和产量潜力低。我们的研究揭示了早熟杂种进一步提高产量潜力的遗传多样性低，或称为遗传瓶颈。此外，随着低投入要求的推广，沿着价格低廉的自交系品种可能更适合长江中下游地区本季种植。
Early-season rice plays a significant role in double rice-cropping system in China to improve the grain yield per unit of area. But recently, the stagnation of grain yield increase has been witnessed for early-season rice varieties in middle-lower reaches of the Yangtze River, particular in the national rice regional adaption trials of southern China. Further, in the early cropping season, hybrid rice did not always perform better than inbred rice in grain production. It is relevant to question whether yield ceilings have been reached in early-seasonindica rice before a new breakthrough on the germplasm exploitation. Field experiments were conducted to evaluate the yield performance of five inbreds and their 12 derived hybrid rice varieties in 2017 and 2018 in Hangzhou, China. Limited yield advantage of early-season hybrids over inbreds was observed, commonly less than 5.00% and averaged as 0.62% in 2017 and 3.20% in 2018. The hybrids always produced more panicles per plant but less grains per panicle with similar growing periods compared with the inbreds. Then, the genetic distance of the hybrid parents was surveyed using 48 selected molecular markers, showing low polymorphisms. Further, they were genotyped for four critical quantitative trait loci for both yield traits and heading date and three ones only for yield traits. So did 60 major early-seasonindicarice varieties at the four pleiotropic loci. Evidence was shown for the high uniform of their haplotype combinations across the tested materials, which could lead to early heading and low yield potential. Our work revealed the low genetic diversity, or called genetic bottleneck, for early-season hybrids to further improve grain yield potential. Moreover, along with the popularization of low-input requirements, the inbred rice varieties of cheap seed price might be a more suitable alternative for this cropping season in middle-lower reaches of the Yangtze River.
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影响因子：
5.8
作者：
Katsura, Keisuke;Maeda, Shuhei;Shiraiwa, Tatsuhiko
通讯作者：
Shiraiwa, Tatsuhiko
影响因子：
44.1
作者：
Weng, Jianfeng;Gu, Suhai;Wan, Jianmin
通讯作者：
Wan, Jianmin
剖析水稻 NCII-III 群体的配合力效应，为了解籼粳杂交中的杂种优势提供见解
DOI：
10.1186/s12284-017-0179-9
发表时间：
2017-08-29
期刊：
Rice (New York, N.Y.)
影响因子：
--
作者：
Zhou H;Xia D;Zeng J;Jiang G;He Y
通讯作者：
He Y
影响因子：
5.6
作者：
Ye J;Niu X;Yang Y;Wang S;Xu Q;Yuan X;Yu H;Wang Y;Wang S;Feng Y;Wei X
通讯作者：
Wei X
qHd1 的自然变异影响高温下抽穗期的加速，对水稻产量性状具有多效性
影响因子：
5.3
作者：
Chen JY;Zhang HW;Zhang HL;Ying JZ;Ma LY;Zhuang JY
通讯作者：
Zhuang JY