Crosstalk among hormones in barley spike contributes to the yield
Crosstalk among hormones in barley spike contributes to the yield
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DOI：
10.1007/s00299-019-02430-0
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发表时间：
2019-05
影响因子：
6.2
通讯作者：
Helmy M. Youssef;M. Hansson
中科院分区：
文献类型：
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作者：
Helmy M. Youssef;M. Hansson
大麦穗部沿着分布的激素比例调节着小穗的发育、萎缩和败育，可能是大麦穗部适应其产量潜力的机制。它是已知的最古老的谷类作物之一，大约有1万年的种植历史。栽培大麦的花序是一个不确定的穗，在每个轴节上产生三个单花小穗，这使其在禾本科植物中独一无二。大麦的产量生产主要由非常重要的参数如分蘖数和每穗小穗数控制。这两个参数是负相关的。因此，研究水稻穗部发育过程中小穗发育的生物学和遗传学规律，对水稻育种具有重要意义。在这里，我们总结了我们目前的理解之间的串扰激素，如生长素，细胞分裂素，赤霉素和脱落酸沿着穗和它们在调节穗和小穗发育的作用。我们的结论是激素的比例在顶端，中央和基部的穗节不仅调节穗发育阶段，但也发育，萎缩和小穗的败育。这种激素依赖的穗粒数沿着变化可能是大麦穗适应其产量潜力的机制。
Key messageThe hormonal ratios along the barley spike regulate the development, atrophy and abortion of the spikelets and could be the mechanism by which the barley spike adapts its yield potential.AbstractBarley (Hordeum vulgareL.) is one of the oldest cereal crops known to be cultivated since about 10,000 years. The inflorescence of cultivated barley is an indeterminate spike that produces three single-flowered spikelets at each rachis node which make it unique among the grasses. The yield production in barley is predominantly controlled by very important parameters such as number of tillers and number of spikelets per spike. These two parameters are negatively correlated. Therefore, studying the biological and genetics of the spikelet development during the spike developmental stages is essential for breeding programs. Here we summarize our current understanding of the crosstalk between hormones such as auxin, cytokinin, gibberellin and abscisic acid along the spike and what is their role in regulating spike and spikelet development in barley. We conclude that the hormonal ratios at the apical, central, and basal sections of the spike not only regulate the spike developmental stages, but also the development, atrophy, and abortion of the spikelets. This hormonal dependent modification of the grain number along the spike could be the mechanism by which the barley spike adapts its yield potential.