苏打盐碱胁迫下粳稻子粒灌浆动态研究

Dynamic Studies on Grain Filling of Japonic Rice under Saline-Sodic Stress

选用粳稻品种"东稻4号"(DD4)、粳稻品系"G19"作为试验材料,分别种植在pH值为8.01和9.03的苏打盐碱地中。在栽培条件相同的情况下,分析2个供试材料在不同苏打盐碱胁迫下水稻灌浆期干物质积累、子粒灌浆速率和含水量的动态变化。结果表明:重度苏打盐碱胁迫下水稻起始灌浆期都延迟5d;强势粒干物质积累都明显高于弱势粒,强势粒前期的灌浆速率高于弱势粒,后期呈明显的下降趋势;"DD4"先于"G19"达到干物质积累的高峰,"G19"强势粒灌浆高峰次数多于"DD4";灌浆期"DD4"无论强势粒还是弱势粒均失水较快,而"G19"强势粒失水快,弱势粒相对平缓。

The Japonica rice cultivar DD4 and strain G19 were grown under saline-sodic stress on rice paddy with pH 8.01 and 9.03,respectively.The effects of saline-sodic stress on the dynamic changes of grain dry matter accumulation,milking rate and water content during rice milking stage were studied under the same conditions.The results showed that starting of the rice filling delays 5 days under severe saline-sodic stress;The superior grains are superior on dry matter accumulation to inferior grains,strong milking rate during former stage and downtrend later;The peak of dry matter accumulation DD4 is earlier than G19,and the times of milking peak of G19 superior grains are more than DD4.Water loss of DD4 is faster to both superior and inferior grains,and in this respect,G19 superior grains are the same whereas inferior grains exhibit slower water loss comparatively.