Praphasanobol Parama, Chokwiwatkul Ratchata, Habila Susinya, Chantawong Yosita, Buaboocha Teerapong, Comai Luca, Chadchawan Supachitra
Biological Sciences Program, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
Center of Excellence in Environment and Plant Physiology, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
Plants (Basel). 2025 Mar 12;14(6):885. doi: 10.3390/plants14060885.
Here, we investigated physiological responses, yield components, starch properties, and starch biosynthesis genes in five Thai rice ( L.) cultivars (SPR1, Hawm Daeng, RD43, RD69, and PTT1) with distinct starch characteristics under salt stress. Salt stress decreased flag leaf greenness (SPAD), normalized difference vegetation index (NDVI) levels, and carotenoid reflectance index 1 (CRI1) levels in all cultivars, resulting in reduced net photosynthesis, transpiration rates, and yield components across all cultivars, with Hawm Daeng and PTT1 being most susceptible. In contrast, RD69 and SPR1 were more tolerant, exhibiting recovered chlorophyll fluorescence levels and total performance index values after 3 days. Salt stress reduced apparent amylose content (AAC) and increased rapidly available glucose (RAG) levels in all cultivars. () expression declined the most in PTT1 and Hawm Daeng. SPAD, NDVI, CRI1, and photosynthetic parameters were correlated with expression at the milky and dough stages of grain development. expression levels showed little to no correlation with slowly available glucose but correlated with resistant starch levels at the booting stage of grain development. Salt stress affected yield components and rice starch quality, with variations depending on salt susceptibility, which in turn affected expression levels during the milky and dough stages of grain development.
在此，我们研究了5个具有不同淀粉特性的泰国水稻（Oryza sativa L.）品种（SPR1、Hawm Daeng、RD43、RD69和PTT1）在盐胁迫下的生理反应、产量构成因素、淀粉特性及淀粉生物合成基因。盐胁迫降低了所有品种的剑叶叶绿素含量（SPAD）、归一化植被指数（NDVI）水平和类胡萝卜素反射指数1（CRI1）水平，导致所有品种的净光合作用、蒸腾速率和产量构成因素降低，其中Hawm Daeng和PTT1最为敏感。相比之下，RD69和SPR1更具耐受性，在3天后叶绿素荧光水平和总性能指数值有所恢复。盐胁迫降低了所有品种的表观直链淀粉含量（AAC）并提高了快速可利用葡萄糖（RAG）水平。（）在PTT1和Hawm Daeng中的表达下降最为明显。在籽粒发育的乳熟期和面团期，SPAD、NDVI、CRI1和光合参数与（）表达相关。（）表达水平与缓慢可利用葡萄糖几乎没有相关性，但与籽粒发育孕穗期的抗性淀粉水平相关。盐胁迫影响产量构成因素和水稻淀粉品质，其变化取决于盐敏感性，进而影响籽粒发育乳熟期和面团期的（）表达水平。
