MP3 是一个增加圆锥花序数的数量性状基因座,它通过与高源性状和易位性状连接,提高了日本水稻的产量潜力

IF 5.6 1区 农林科学 Q1 AGRONOMY
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引用次数: 0

摘要

背景:提高水稻产量潜力是满足不断增长的粮食需求和实现全球粮食安全的一项重要战略。MP3 最近被鉴定为水稻的一个数量性状基因座(QTL),它能增加圆锥花序数,进而增加穗沉(每平方米的小穗总数)。在当前气候条件下,如果没有改良的源性状,MP3并不能提高高产栽培品种的谷物产量。研究目的:本研究旨在确定MP3是否能提高水稻栽培品种背景下的谷物产量,并分析与产量提高相关的关键变量。近等基因 MP3 品系 Hokuriku 193-MP3 和 IR64-MP3 与它们的亲本栽培品种结合使用。北陆 193 是日本的一个高产栽培品种,生物量产量高,而 IR64 是热带地区的一个高产巨型栽培品种。Hokuriku 193-MP3 的谷物产量比 Hokuriku 193 高 7%;但 IR64-MP3 的产量并不比 IR64 高。与 IR64 和 IR64-MP3 相比,北陆 193 和北陆 193-MP3 的叶面积更大,生物量更高,茎秆和叶鞘中积累的非结构性碳水化合物(NSC)也更多。Hokuriku 193-MP3 在打顶后 16 d 显著降低了茎秆和叶鞘中的 NSC 含量,收获指数也高于 Hokuriku 193;但 IR64-MP3 在这些变量上与 IR64 没有差异。相比之下,IR64 缺乏这些能力。这些研究结果表明,MP3 提高了日本水稻栽培品种的产量潜力,其中北陆 193 的产量在日本最高。MP3 以及 Hokuriku 193 的高源性状和易位性状可为世界各地未来的高产育种计划带来益处。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
MP3, a quantitative trait locus for increased panicle number, improves rice yield potential in Japan by connecting with high source and translocation traits

Context: I

ncreasing rice yield potential is an important strategy for meeting rising food demand and achieving global food security. MP3 was recently identified as a quantitative trait locus (QTL) in rice that increases panicle number and thereby sink size (the total number of spikelets per square meter). Under current climatic conditions, MP3 did not increase grain yield in a high-yielding cultivar in the absence of improved source traits.

Objective:

This study aimed to determine whether MP3 increases grain yield in a rice cultivar background with improved biomass production and to analyze the key variables linked to yield improvement.

Methods

Two-year experiments were carried out on a paddy field with nitrogen (N) applications in Tsukuba, Japan. Near-isogenic MP3 lines, Hokuriku 193-MP3 and IR64-MP3, were used in conjunction with their parental cultivars. Hokuriku 193 is a high-yielding cultivar in Japan with high biomass production, and IR64 is a high-yielding mega-cultivar in the tropics.

Results

Both Hokuriku 193-MP3 and IR64-MP3 increased panicle quantity and sink size when compared to the parental cultivars, regardless of N treatment. Hokuriku 193-MP3 had a 7 % higher grain yield than Hokuriku 193; however, IR64-MP3 did not yield more than IR64. Hokuriku 193 and Hokuriku 193-MP3 had larger leaf areas, higher biomass, and accumulated more non-structural carbohydrate (NSC) in the culms and leaf sheaths at heading than IR64 and IR64-MP3. Hokuriku 193-MP3 significantly reduced the NSC level in the culm and leaf sheaths at 16 d after heading and had a higher harvest index than Hokuriku 193; however, IR64-MP3 did not differ from IR64 with regard to these variables.

Conclusion

Hokuriku 193 has surplus source and translocation abilities that can fill the MP3-enlarged sink, resulting in a higher grain yield. In comparison, IR64 lacks these abilities. These findings imply that MP3 has boosted the yield potential of rice cultivars in Japan, with Hokuriku 193 having the highest yield in Japan.

Significance

This study shows that balanced improvements in sink, source, and translocation are essential for increasing rice yield potential. MP3 and the high source and translocation traits of Hokuriku 193 could benefit future high yield breeding initiatives around the world.

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来源期刊
Field Crops Research
Field Crops Research 农林科学-农艺学
CiteScore
9.60
自引率
12.10%
发文量
307
审稿时长
46 days
期刊介绍: Field Crops Research is an international journal publishing scientific articles on: √ experimental and modelling research at field, farm and landscape levels on temperate and tropical crops and cropping systems, with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.
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