Impact of osmotic stress on the growth and root architecture of introgression lines derived from a wild ancestor of rice and a modern cultivar.
Impact of osmotic stress on the growth and root architecture of introgression lines derived from a wild ancestor of rice and a modern cultivar.
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DOI：
10.1002/pei3.10026
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发表时间：
2020-09
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许多现代水稻品种在灌溉条件下被集中选择高产性能，减少了它们的遗传多样性，并可能增加它们对干旱等非生物胁迫的敏感性。在这项研究中，我们测试了从野生祖先普通野生稻的DNA片段导入到现代栽培品种O。sativa cv Curinga（CUR）的渗透胁迫。苗的生长。普通茅属植物对渗透胁迫的耐受性较强，在轻度渗透胁迫下总根尖数增加。一个渐渗系表现出更大的地上部生长，根的生长，和更高的总根尖数比亲线CUR在渗透胁迫下。脱落酸（阿坝）是植物对非生物胁迫应答的关键激素。根和地上部的生长均受到影响。普通草对阿坝的反应比CUR更敏感。渐渗系的生长反应对阿坝的敏感程度各不相同，有些系与它们对渗透胁迫的敏感性有关。我们的研究结果表明，水稻对阿坝和渗透胁迫的反应是基因型依赖的，水稻对阿坝的生长反应并不是渐渗系对非生物胁迫的恢复力的一致指标。
Many modern rice varieties have been intensively selected for high‐yielding performance under irrigated conditions, reducing their genetic diversity and potentially increasing their susceptibility to abiotic stresses such as drought. In this study, we tested benefits for stress tolerance of introducing DNA segments from wild ancestor Oryza rufipogon to the modern cultivar O. sativa cv Curinga (CUR) by applying a gradient of osmotic stress to both parents and seven introgressed lines. Shoot growth of O. rufipogon had a high tolerance to osmotic stress, and the number of total root tips increased under mild osmotic stress. One introgression line showed greater shoot growth, root growth, and higher number of total root tips than the parent line CUR under osmotic stress. Abscisic acid (ABA) is a key hormone mediating plant responses to abiotic stresses. Both root and shoot growth of O. rufipogon were much more sensitive to ABA than CUR. Introgression lines varied in the extent to which the sensitivity of their growth responses to ABA and some lines correlated with their sensitivity to osmotic stress. Our results suggest that rice responses to ABA and osmotic stress are genotype dependent, and growth responses of rice to ABA are not a consistent indicator of resilience to abiotic stress in introgression lines.