Department of Land Management, University Putra Malaysia (UPM), Serdang, 43400 Selangor, Malaysia ; Department of Agricultural Chemistry, Hajee Mohammad Danesh and Technology University, Dinajpur 5200, Bangladesh.
Department of Crop Science, Faculty of Agriculture, University Putra Malaysia (UPM), Serdang, 43400 Selangor, Malaysia.
Biomed Res Int. 2014;2014:208584. doi: 10.1155/2014/208584. Epub 2014 Jan 22.
Five Malaysian rice (Oryza sativa L.) varieties, MR33, MR52, MR211, MR219, and MR232, were tested in pot culture under different salinity regimes for biochemical response, physiological activity, and grain yield. Three different levels of salt stresses, namely, 4, 8, and 12 dS m(-1), were used in a randomized complete block design with four replications under glass house conditions. The results revealed that the chlorophyll content, proline, sugar content, soluble protein, free amino acid, and yield per plant of all the genotypes were influenced by different salinity levels. The chlorophyll content was observed to decrease with salinity level but the proline increased with salinity levels in all varieties. Reducing sugar and total sugar increased up to 8 dS m(-1) and decreased up to 12 dS m(-1). Nonreducing sugar decreased with increasing the salinity levels in all varieties. Soluble protein and free amino acid also decreased with increasing salinity levels. Cortical cells of MR211 and MR232 did not show cell collapse up to 8 dS m(-1) salinity levels compared to susceptible checks (IR20 and BRRI dhan29). Therefore, considering all parameters, MR211 and MR232 showed better salinity tolerance among the tested varieties. Both cluster and principal component analyses depict the similar results.
五种马来西亚水稻(Oryza sativa L.)品种,MR33、MR52、MR211、MR219 和 MR232,在不同盐度条件下进行盆栽试验,以测试其生化反应、生理活性和籽粒产量。采用随机完全区组设计,在温室条件下进行了四个重复,设置了三个不同的盐度胁迫水平,分别为 4、8 和 12 dS m(-1)。结果表明,不同盐度水平对所有基因型的叶绿素含量、脯氨酸、糖含量、可溶性蛋白、游离氨基酸和单株产量都有影响。叶绿素含量随着盐度的升高而降低,但所有品种的脯氨酸含量都随着盐度的升高而升高。还原糖和总糖在 8 dS m(-1) 时增加,在 12 dS m(-1) 时减少。非还原糖在所有品种中随盐度的升高而减少。可溶性蛋白和游离氨基酸也随盐度的升高而减少。与敏感对照(IR20 和 BRRI dhan29)相比,MR211 和 MR232 的皮层细胞在 8 dS m(-1) 盐度水平下没有出现细胞崩溃。因此,考虑到所有参数,MR211 和 MR232 在测试品种中表现出更好的耐盐性。聚类和主成分分析都得到了相似的结果。