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干旱条件下水稻耐旱品种湘中籼２号比不耐旱品种湘早籼１２号具有较低的质膜相对透性、叶绿素含量降低较少，表明耐旱品种受伤害较轻，两个品种的抗坏血酸。过氧化物酶（ＡｓＡ－ＰＯＤ）均降低，但耐旱品种降低较少。耐旱品种的谷胱甘肽还原酶（ＧＲ）活性在干旱初期提高，不耐旱品种的则变化不大。０．０１ｍｍｏｌ／Ｌ的百草枯和０．１ｍｍｏｌ／Ｌ的Ｈ２Ｏ２亦能诱导耐旱品种的ＧＲ活性，但对不耐旱品种的ＧＲ活性不受影响，说明可能是干旱诱导的氧化胁迫诱导了ＧＲ活性。干旱条件下两品种的抗坏血酸（ＡｓＡ）和还原型谷胱甘肽（ＧＳＨ）含量均是先升后降，但耐旱品种提高幅度较大。结果表明，耐旱品种的叶绿体保护系统的活性比不耐旱品种的高。
The drought-tolerant rice variety Xiangzhongxian 2 had lower relative permeability of the plasma membrane and less chlorophyll content than the drought-tolerant Xiangzaoxian 12, indicating that the drought-tolerant cultivars were less susceptible to damage and the two cultivars Of ascorbic acid. Peroxidase (AsA-POD) decreased, but drought-tolerant varieties reduced less. Glutathione reductase (GR) activity of drought-tolerant cultivars increased in the early drought period but not in drought-tolerant cultivars. 0.01 mmol / L paraquat and 0.1 mmol / L H2O2 also induced GR activity in drought-tolerant cultivars, but did not affect GR activity in drought-tolerant cultivars, suggesting that drought-induced oxidative stress may induce GR active. Ascorbic acid (AsA) and reduced glutathione (GSH) contents of the two cultivars increased first and then decreased under drought conditions, but drought tolerant cultivars increased significantly. The results showed that the chloroplast protection system of drought-tolerant cultivars was more active than the drought-tolerant cultivars.