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| 1 | 不同品种紫薯淀粉结构与其面团品质的关系显示文摘本文以紫薯淀粉为对象,研究其微观结构、晶体特性、粒径分布、紫薯淀粉-小麦粉面团的粉质、糊化、流变特性及水分分布状态、淀粉结构与面团之间的相关性。结果表明:紫薯淀粉颗粒呈圆形和半球形,平均颗粒范围43.903~55.842μm,体积呈三峰型分布,X衍射表明绝大多数紫薯淀粉为CA型,结晶度36.76%~54.28%。紫薯淀粉面团的形成时间、稳定时间范围分别在2.20~3.90 min和3.20~4.10 min。糊化温度升高,在70.10~85.65℃范围,其它糊化特性降低,有利于面团的稳定性。储能模量(G')、损耗模量(G'')显著增加,损耗角正切值(tanδ)先下降后上升,表明混合体系中分子交联的程度增加,使面团有弹性,而水分分布状态存在差异。相关性分析表明,结晶度与吸水率、稳定时间、弱化度、公差指数、糊化温度呈负相关,与峰值黏度、顶点时间、最低黏度、最终黏度、回生值呈现正相关。平均粒径与弱化度、衰减值呈负相关,与顶点时间、结晶度呈正相关。本研究结果为淀粉的选择和淀粉面团生产专用的紫薯品种的栽培提供了理论基础。 | 张梦潇 周文化 杨代明 戴少华 李勇 周虹 | 2021 | 中国食品学报2021，21，8： | 6 |
| 2 | Moderate drought alleviates the damage to grain quality at high temperatures by improving the starch synthesis of inferior grains in japonica rice显示文摘In agricultural production,temperature and moisture are important factors affecting grain yield and quality.Although moderate drought at the grain-filling stage can effectively alleviate the damage caused by high temperature,the specific regulatory mechanism driving the effect of moderate drought at the high temperature on starch synthesis is still unclear.To explore the effects and mechanisms of high temperature and moderate drought on rice starch synthesis at the grainfilling stage,the activities of enzymes and expression levels of the genes involved in starch synthesis under four different treatments involving high temperature and/or water stress(CK,HT,WS,and HT+WS)were investigated in this study.The starch synthesis of a japonica inbred rice was measured under the four treatments during the grain filling.The results show that the effects of high temperature and moderate drought on grain filling mainly occur in the inferior grains of rice.Through the regulation of enzymes involved in starch synthesis and the expression levels of their main genes,the synthesis of rice starch can be affected.Therefore,the high temperature and moderate drought were antagonistic,and moderate drought can alleviate the damage to grain quality at a high temperature by improving the starch synthesis of inferior grains in japonica rice.This study provides a basis for stress-resistance cultivation and breeding strategies of rice with high temperature tolerance. | TONG Hui DUAN Hua WANG Sheng-jun SU Jing-ping SUN Yue LIU Yan-qing TANG Liang LIU Xue-jun CHEN Wen-fu | 2022 | Journal of Integrative Agriculture2022，21，10： | 0 |
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