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Effect of Drought stress on Resistant starch content and Glycemic index of rice (Oryza sativa L.)
Starch ( IF 2.6 ) Pub Date : 2020-04-15 , DOI: 10.1002/star.201900229 Awadhesh Kumar 1 , Goutam Kumar Dash 1 , Madhusmita Barik 1 , Puja Archana Panda 1 , Milan Kumar Lal 2 , Mirza Jaynul Baig 1 , Padmini Swain 1
Starch ( IF 2.6 ) Pub Date : 2020-04-15 , DOI: 10.1002/star.201900229 Awadhesh Kumar 1 , Goutam Kumar Dash 1 , Madhusmita Barik 1 , Puja Archana Panda 1 , Milan Kumar Lal 2 , Mirza Jaynul Baig 1 , Padmini Swain 1
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Drought stress is the most devastating abiotic stress which severely affects starch biosynthesis, thus altering the glycemic index (GI) of rice grains. It shortens the period of grain filling by rapidly translocating assimilates to grains, thereby decreasing amylose content (AC), resistant starch (RS), and increasing GI value. Among 30 genotypes tested, ZHU‐11‐26, IR 20, and Annada differ in exhibiting a much lower reduction in AC and RS which result in insignificant change in GI (<1) under drought stress. Two genotypes (ZHU‐11‐26 and Pathara) are selected for granule bound starch synthase I expression analysis on the basis of their contrasting GI and RS content. The gene is highly and significantly expressed at the dough stage of grain development and shows a positive association between its expression and RS content. Drought is very common in most parts of the world in the present climate‐change scenario, where even mild terminal stress may affect grain filling rate and cause the increment in GI value of grains. In this context, identification of less responsive genotypes with a lesser change in GI under drought stress may help in developing rice varieties for the diabetics even grown under stress‐prone environments.
中文翻译：
干旱胁迫对水稻抗性淀粉含量和血糖指数的影响
干旱胁迫是最具有破坏力的非生物胁迫，它严重影响淀粉的生物合成，从而改变稻米的血糖指数（GI）。通过将同化物快速转移到谷物中，可缩短谷物填充时间，从而降低直链淀粉含量（AC），抗性淀粉（RS）和增加GI值。在测试的30个基因型中，ZHU-11-26，IR 20和Annada的差异在于AC和RS的降低要低得多，这导致干旱胁迫下GI的变化很小（<1）。根据两种基因型（GI和RS含量）的差异，选择了两种基因型（ZHU-11-26和Pathara）进行颗粒结合淀粉合酶I表达分析。该基因在谷物发育的生面团阶段被高度且显着表达，并且在其表达与RS含量之间呈正相关。在当前的气候变化情景中，干旱在世界上大多数地区非常普遍，那里即使是轻微的终末应力也可能影响谷物的填充率并导致谷物的GI值增加。在这种情况下，鉴定干旱条件下胃肠道反应较小的反应性较低的基因型，甚至有助于在易受环境影响的条件下为糖尿病患者开发水稻品种。
更新日期：2020-04-15
中文翻译：
干旱胁迫对水稻抗性淀粉含量和血糖指数的影响
干旱胁迫是最具有破坏力的非生物胁迫，它严重影响淀粉的生物合成，从而改变稻米的血糖指数（GI）。通过将同化物快速转移到谷物中，可缩短谷物填充时间，从而降低直链淀粉含量（AC），抗性淀粉（RS）和增加GI值。在测试的30个基因型中，ZHU-11-26，IR 20和Annada的差异在于AC和RS的降低要低得多，这导致干旱胁迫下GI的变化很小（<1）。根据两种基因型（GI和RS含量）的差异，选择了两种基因型（ZHU-11-26和Pathara）进行颗粒结合淀粉合酶I表达分析。该基因在谷物发育的生面团阶段被高度且显着表达，并且在其表达与RS含量之间呈正相关。在当前的气候变化情景中，干旱在世界上大多数地区非常普遍，那里即使是轻微的终末应力也可能影响谷物的填充率并导致谷物的GI值增加。在这种情况下，鉴定干旱条件下胃肠道反应较小的反应性较低的基因型，甚至有助于在易受环境影响的条件下为糖尿病患者开发水稻品种。
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