A near-isogenic line for spikelet number in rice with a genetic background of IR64 under various fertilizer conditions

IF 1.6 3区农林科学 Q2 AGRONOMY

Plant Production Science Pub Date : 2022-10-02 DOI:10.1080/1343943X.2022.2132966

K. Sasaki, M. Obara

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Abstract

ABSTRACT The total spikelet number (TSN) per panicle is an essential factor involved in grain yield among yield components in rice. IR64-NIL12 carrying qTSN12.2-YP4, which was detected on chromosome 12 for TSN per panicle, has been developed in a previous study. It is important to characterize the environment of gene function to increase yields. Thus, we attempted to evaluate IR64-NIL12 grown under no, low, and high fertilizer conditions in 2019 and 2020. Grain yields of IR64-NIL12 were significantly higher than that of IR64 in all conditions. The average grain yield of each condition for IR64 and IR64-NIL12 ranged from 387 to 616 g m−2. Therefore, qTSN12.2-YP4 would have an increasing effect on grain yield within this range. The ratio of fertility improved in IR64-NIL12. This rice line exhibited modified traits, such as tiller number and plant height (during the vegetative stage), as well as panicle number (at maturity), which may confer an advantage in terms of light-intercepting characteristics. We also focused on the number of unproductive tillers and dry weight per tiller at the heading stage to investigate the mechanism of the increasing effect of qTSN12.2-YP4 on TSN per panicle. There is a significant difference in dry weight per tiller at heading between IR64 and IR64-NIL12, but not in the percentage of unproductive tillers. Therefore, this result indicated that qTSN12.2-YP4 contributes to increasing dry weight per tiller until the heading stage and, consequently, TSN per panicle. Graphical abstract

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具有IR64遗传背景的水稻小穗数近等基因系

摘要在水稻产量构成因素中，每穗总小穗数是影响产量的重要因素。在之前的一项研究中已经开发了携带qTSN12.2-YP4的IR64-NIL12，该基因在每穗TSN的12号染色体上被检测到。表征基因功能的环境对于提高产量是很重要的。因此，我们试图评估2019年和2020年在无肥、低肥和高肥条件下生长的IR64-NIL12。在所有条件下，IR64-NIL12的籽粒产量均显著高于IR64。IR64和IR64-NIL12在每种条件下的平均籽粒产量在387至616 g m−2之间。因此，在这个范围内，qTSN12.2-YP4对粮食产量有增加作用。IR64-NIL12的生育率有所提高。该水稻品系表现出改良的性状，如分蘖数和株高（营养期），以及穗数（成熟期），这可能在截光特性方面具有优势。我们还重点研究了抽穗期的非生产分蘖数和每穗干重，以探讨qTSN12.2-YP4对每穗TSN增加作用的机制。IR64和IR64-NIL12在抽穗期的单株干重方面存在显著差异，但在非生产分蘖的百分比方面没有显著差异。因此，这一结果表明，qTSN12.2-YP4有助于增加每穗干重，直到抽穗期，从而增加每穗TSN。图形摘要

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来源期刊

Plant Production Science 农林科学-农艺学

CiteScore

5.10

自引率

4.00%

发文量

审稿时长

>36 weeks

期刊介绍： Plant Production Science publishes original research reports on field crops and resource plants, their production and related subjects, covering a wide range of sciences; physiology, biotechnology, morphology, ecology, cropping system, production technology and post harvest management. Studies on plant production with special attention to resource management and the environment are also welcome. Field surveys on cropping or farming system are also accepted. Articles with a background in other research areas such as soil science, meteorology, biometry, product process and plant protection will be accepted as long as they are significantly related to plant production.