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Differences between two wheat genotypes in the development of floret primordia and contents of pigments and hormones

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The Crop Journal 2024年第4期12卷 1196-1207页

作者： Liangyun Wen Yaqun Liu Bingjin Zhou Wan Sun Xuechen Xiao Zhimin Wang Zhencai Sun Zhen Zhang Yinghua Zhang College of Agronomy and Biotechnology China Agricultural UniversityBeijing 100193China Engineering Technology Research Center for Agriculture in Low Plain Areas Cangzhou 061800HebeiChina

Promoting more floret primordia within a spike to acquire fertile potential during the differentiation and pre-dimorphism phases is critical for increasing the number of fertile florets per spike(NFFs).However,it is yet unknown the physiological mechanism regulating the complex and dynamic *** study aimed to clarify how intra-spike hormones,pigments,and assimilates coordinate with each other to regulate spike morphology and then floret primordia development.A two-year field experiment was conducted with two winter wheat genotypes:N50(big-spike with greater NFFs)and SM22(mediumspike with fewer NFFs).We monitored high temporal and spatial-resolution changes in the number and morphology of floret primordia within a spike,as well as in intra-spike hormones,pigments,and *** results revealed that the big-spike genotype had more NFFs than the medium-spike genotype,not only because they had more spikelets,but also because they had greater NFFs mainly at central *** floret primordia at central spikelets had sufficient time to develop and acquire fertile potential during the differentiation phase(167-176 d after sowing,DAS)and the pre-dimorphism phase(179 DAS)for the big-spike genotype than the medium-spike *** primordia with fertile morphology during the pre-dimorphism phase always developed into fertile florets during the dimorphism *** early-developed floret primordia most proximal and intermediate to the rachis in the big-spike genotype developed faster than the medium-spike ***,the spike dry matter and pigments(chlorophyll a,chlorophyll b,carotene,and carotenoids)content during 170-182 DAS,auxin(IAA)and cytokinin(CTK)content on 167 DAS were significantly higher in the big-spike genotype than in the medium-spike genotype,while jasmonic acid(JA)content was significantly lower in the big-spike genotype compared to the medium-spike genotype during 167-182 *** the significant differences in intra-s

关键词： Fertile florets Floret primordia development intra-spike hormones Jasmonic acid Photosynthetic pigments

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