An ethylene biosynthesis enzyme controls quantitative variation in maize ear length and kernel yield.
An ethylene biosynthesis enzyme controls quantitative variation in maize ear length and kernel yield.
复制标题
乙烯生物合成酶控制玉米穗长度和籽粒产量的定量变化
DOI：
10.1038/s41467-021-26123-z
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发表时间：
2021-10-05
影响因子：
16.6
通讯作者：
Zhang Z
中科院分区：
文献类型：
--
作者：
Ning Q;Jian Y;Du Y;Li Y;Shen X;Jia H;Zhao R;Zhan J;Yang F;Jackson D;Liu L;Zhang Z
玉米穗长和籽粒数因品系不同而不同，但对穗长的分子基础及其对籽粒数的影响却知之甚少。在这里，我们描述了一个数量性状基因座，qEL7，用来鉴定一个控制穗长、花数和育性的玉米基因。QEL7编码1-氨基环丙烷-1-羧酸氧化酶2(ACO2)，该基因在乙烯生物合成的最后一步发挥作用，并在花序发育的特定区域中表达。通过ZmACO2的基因编辑确认qEL7基因，可以减少发育中的果穗中乙烯的产生，促进分生组织和花的发育，使杂交种的单穗产量增加13.4%。我们的发现表明，乙烯是花序发育的关键信号，影响小穗数、花育性、穗长和籽粒数，也为通过优化玉米或其他谷物的乙烯水平来提高谷物生产力提供了工具。玉米穗大小和籽粒数存在较大的遗传变异。在这里，作者表明，编码乙烯生物合成酶的基因变异影响耳朵长度、花的可育性和籽粒产量，表明乙烯信号在花序发育过程中发挥重要作用。
Maize ear size and kernel number differ among lines, however, little is known about the molecular basis of ear length and its impact on kernel number. Here, we characterize a quantitative trait locus, qEL7, to identify a maize gene controlling ear length, flower number and fertility. qEL7 encodes 1-aminocyclopropane-1- carboxylate oxidase2 (ACO2), a gene that functions in the final step of ethylene biosynthesis and is expressed in specific domains in developing inflorescences. Confirmation of qEL7 by gene editing of ZmACO2 leads to a reduction in ethylene production in developing ears, and promotes meristem and flower development, resulting in a ~13.4% increase in grain yield per ear in hybrids lines. Our findings suggest that ethylene serves as a key signal in inflorescence development, affecting spikelet number, floral fertility, ear length and kernel number, and also provide a tool to improve grain productivity by optimizing ethylene levels in maize or in other cereals. Considerable genetic variation exists in maize ear size and kernel number. Here the authors show that variation in a gene encoding an ethylene biosynthetic enzyme impacts ear length, flower fertility and kernel yield suggesting an important role for ethylene signaling during inflorescence development.
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