Effect of GA-sensitivity on wheat early vigor and yield components under deep sowing
Effect of GA-sensitivity on wheat early vigor and yield components under deep sowing
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DOI：
10.3389/fpls.2015.00487
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发表时间：
2015-07-10
影响因子：
5.6
通讯作者：
Peleg, Zvi
中科院分区：
文献类型：
--
作者：
Amram, Avishay;Fadida-Myers, Aviya;Peleg, Zvi
苗木的建立是实现均匀田间林分和稳定产量的关键因素。在地中海条件下，上层土壤水分有限，幼苗可能会频繁脱水。降低高度（Rht）-B1 b和Rht-D1 b半显性矮秆等位基因的存在导致对赤霉素（GAI）不敏感，因此，深播出苗不良。引入替代矮化基因，从而保持赤霉素反应（GAR）和胚芽鞘长度，有助于更好地从深播中出苗。最初，47个小麦品种携带不同的Rht等位基因进行了筛选，他们的能力，从深播出现，然后选择其中17个在田间进行详细的生理特性。含有GAI等位基因的现代小麦品系显示出比GAR品系显著更低的深播出苗百分比，即，52%和74%。在早期发育阶段的差异与粮食产量，所示的现代GAI品种减少37.3%。我们的研究结果表明，替代矮秆基因的潜力，提高幼苗建立和粮食产量在地中海式的环境。
Establishment of seedlings is a key factor in achievement of uniform field stands and, consequently, stable yields. Under Mediterranean conditions, soil moisture in the upper layer is limited and seedlings may be exposed to frequent dehydration events. The presence of the Reduced height (Rht)-B1b and Rht-D1b semi-dominant dwarfing alleles results in insensitivity to gibberellin (GAI) and, hence, poor emergence from deep sowing. Introduction of alternative dwarfing genes and, thereby, preservation of the gibberellin response (GAR) and coleoptile length, contributes to better emergence from deep sowing. Initially 47 wheat cultivars carrying different Rht alleles were screened for their ability to emerge from deep sowing, and then 17 of them were selected for detailed physiological characterization in the field. The modern wheat lines containing GAI alleles showed significantly lower percentages of emergence from deep sowing than the GAR lines, i.e., 52 and 74%, respectively. Differences in early developmental stages were associated with grain yield, as indicated by a reduction of 37.3% in the modern GAI cultivars. Our results demonstrate the potential of alternative dwarfing genes for improving seedling establishment and grain yields in Mediterranean-like environments.