Evaluating Rice for Salinity and Submergence Using Pot-Culture Provides a Systematic Tolerance Assessment at the Seedling Stage

R. Muthu Vijayaragavan, E. Murugan
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Abstract

The initial pot culture study at Department of Plant Breeding and Genetics, Agricultural College and Research Institute, Madurai in rice was conducted to confirm the tolerance mechanism of the donor parents for salinity and submergence separately towards the physiological traits. The parents (ADT 43 and IWP) and donor (FL 478 for salinity and FR 13A for Submergence) were raised in a paper cup maintained separately for salinity and submergence then it was transplanted pots. In each pot, five seedlings were planted and totally fifteen plants were maintained in saline and non-saline condition with three replications. Observations were recorded for all the plants in both saline and non-saline conditions. Regarding for submergence screening, the mud pots along with 14 days old seedlings were drowned in concrete cement tank for 14 days of complete submergence. After 14 days of complete submergence, the samples were collected from each replication both in normal and submergence condition. Hence from the foregoing physiological factors the tolerant donor FL 478 had high level of stable chlorophyll content and also chlorophyll a/b ratio was found unwavering in tolerant donor. Besides the donor parent FR 13A had a ability to retain almost the same level of carbohydrate, starch, non-structural carbohydrate and soluble sugar content under submergence condition. Facts from the study can help rice breeders and other scientists screen and select salinity and submergence tolerant rice breeding lines for variety development and related research, and use the lines identified as tolerant in developing new cultivars.
盆栽水稻耐盐性和淹水性评价为水稻苗期耐盐性评价提供了系统的方法
在水稻马杜赖农学院植物育种与遗传系进行盆栽初步研究,分别从生理性状上确定供体亲本对盐度和淹水的耐受机制。将亲本(ADT 43和IWP)和供体(FL 478盐度和FR 13A浸泡)分别培养在一个分别保持盐度和浸泡的纸杯中,然后移栽盆中。每盆种植5株幼苗,在盐水和非盐水条件下共维持15株,重复3次。记录了所有植物在盐水和非盐水条件下的观察结果。在淹水筛选方面,将泥盆连同14天大的幼苗一起浸泡在混凝土水泥罐中,完全淹水14天。完全浸没14天后,在正常和浸没条件下采集每个复制的样品。综上所述,耐受性供体FL 478具有较高的稳定叶绿素含量,且叶绿素a/b比值在耐受性供体中保持不变。此外,供体亲本FR 13A在淹水条件下能保持几乎相同水平的碳水化合物、淀粉、非结构性碳水化合物和可溶性糖含量。研究结果可以帮助水稻育种家和其他科学家筛选和选择耐盐耐淹水稻选育品系进行品种开发和相关研究,并利用经鉴定的耐盐耐淹水稻选育品系培育新品种。
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