旱涝交替胁迫对水稻抗折力的影响及其机理分析

Impact of Droughts Alternating Stress on the Fracture Resistance against Rice and Its Mechanism Analysis

采用盆栽试验研究了水稻分蘖期和拔节期旱涝交替胁迫后的对水稻细观结构、微观结构、茎秆充数度及其抗折力的影响规律。研究结果表明:旱涝胁迫后茎粗、叶鞘厚度、与抗折力无正相关。大维管束的数目与抗折力呈正相关,拔节期轻旱使茎秆干物质累积量和所占比例提高,对水稻抗折力影响较大;重度旱胁迫无法提高水稻的抗折力。分蘖期的干旱胁迫虽然大维管束的面积有所增大,但总体抗折力无增加。因此蓄水控灌模式下对水稻拔节期进行旱涝胁迫程度适宜控制,可获得较传统浅水勤灌更高的抗倒伏能力。

Rice tillering stage and jointing stage were studied by potted plant experiments of droughts alternating stress on rice after the microscopic structure, microstrncture, stem sucks, and the influence law of bending force. The results showed that the stem diameter and leaf sheath thickness after drought stress were without a positive correlation with bending force. Dave bundle was positively correlated with the number of bending force, made the stem elongation stage light drought dry matter accumulation amount and the higher the percentage and the greater influence on the flexural strength of rice. The severe drought stress can＇t improve rice bending force. Tillering stage of drought stress while dave the area of the tube bundle increased, but not increased overall bending force. So water filling stages of rice control irrigation mode for appropriate control and drought stress level, can be obtained thin1 traditional shallow water frequently filling and higher resistance to lodging.