College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, China.
College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, China.
Carbohydr Polym. 2021 Oct 1;269:118336. doi: 10.1016/j.carbpol.2021.118336. Epub 2021 Jun 16.
A pot experiment was conducted to explore the effects of high-quality (Huanghuazhan, HH), drought-resistant (IR, IRAT109) and drought-susceptible cultivars (ZS, Zhenshan97) under flooding irrigation and dry cultivation (D) on the starch accumulation and synthesis, physicochemical traits of starch granules and rice grain quality at the upper (U) and lower panicle. Under D treatment, IR and ZS had lower rice quality, especially the appearance and cooking quality. DHH-U had the highest appearance, nutritional and cooking quality among all cultivars under D treatment, which could be ascribed to the synthesis of more short-branch chain amylopectin and correspondingly higher starch granule tightness. DHH-U also maintained ordered carbohydrate structure, crystalline regions, and many hydrophilic and hydrophobic functional groups in starch granules before pasting. It could prevent the polymerization of small molecules to avoid the formation of macromolecules after pasting. Overall, these findings may facilitate the improvement of grain quality in rice dry cultivation.
采用盆栽试验研究了在淹水灌溉和旱作（D）条件下，优质（Huanghuazhan，HH）、抗旱（IR，IRAT109）和抗旱品种（ZS，Zhenshan97）对水稻上部（U）和下部稻穗淀粉积累和合成、淀粉颗粒理化特性以及稻米品质的影响。在 D 处理下，IR 和 ZS 的稻米品质较低，特别是外观和蒸煮品质。在 D 处理下，DHH-U 的外观、营养和蒸煮品质均为所有品种中最高，这可归因于更多短支链淀粉的合成和相应更高的淀粉颗粒紧密度。DHH-U 在糊化前还保持淀粉颗粒中碳水化合物结构有序、结晶区以及许多亲水和疏水官能团。它可以防止小分子的聚合，避免糊化后大分子的形成。总的来说，这些发现可能有助于提高旱作水稻的籽粒品质。
