Improvement of plant propagation in tropical problem-soils

泰国东北部盐渍化地区的杂草调查是与Kasesart大学合作进行的，目的是收集有用的遗传资源，以改善一年中有旱季和雨季的热带季风区问题土壤中的植被。利用耐盐性杂草进行耐盐性强化育种技术的研究。1.耐盐性杂草调查：调查了泰国7个省（Nakhonrachasima、Mahasarakam、孔敬、Skonnakhon、乌隆他尼、素林和斯里沙吉）17个地区的杂草和土壤特性。2.耐盐植物的筛选：香根草（Vetivara zizani coides Nash）愈伤组织在1.5%的盐浓度下仍表现出较高的耐盐性。成功地进行了再生，并在盐碱土中进行了耐盐性的保持试验。3.耐盐机制：本研究通过对盐胁迫下不同耐盐生物型和盐敏感生物型的白茅与籼、粳稻品种的比较，研究了盐胁迫下不同耐盐生物型和盐敏感生物型白茅对盐的吸收和分配，4.耐盐杂草对盐碱地的适应性研究：在Kasesart大学的受盐影响的田地中测试了所收集的耐盐杂草，并且正在收集数据以评估草本杂草在恢复植被中的有效性以及对微生物学的影响。环境，包括土壤特性。

Survey of weeds in the salinized areas in Northeast Thailand was conducted with cooperation of Kasesart University for the purpose of collecting the useful genetic resources to improve the vegetation in the problem soils of the tropical monsoon areas which have the dry and rainy seasons in a year. Salt-tolerant weeds were utilized to develop the propagatinal technique and to select the fortified plants in salt tolerance. Furthermore, the collected plants were studied for clarifying the mechanism of salt tolerance and salt damage biochemically and evaluating the effectiveness in greening the salt-affected soil.1.Survey of weeds tolerant to salinity : Weeds and soil characteristics of 17 areas of 7 provinces (Nakhonrachasima, Mahasarakam, Khon Kaen, Skonnakhon, Udonthani, Surin, and Srisaket) were surveyed. Totally, 33 families and 132 species were identified and 27 families and 79 species of them were remained alive at high salinity soils more than 2mS/cm in EC value.2.Selection of salt-tolerant plants : Some of the calli induced from vetivar Vetivara zizani coides Nash) plant showed high salt tolerance even under 1.5% salt concentration. They were regenerated successfully and tested in the salinity soil to conform the maintenance of salt tolerance.3.Mechanism of salt tolerance : Comparison between salt-tolerant and salt-sensitive biotypes of Imperata sylindrica and indica and japonica rice varieties, respectively, were conducted to clarify the biochemical mechanism by investigating the absorption and disrtibution of salt, compatible solutes, and scavenging system of activated oxygen.4.Adaptibility of salt-tolerant weeds to salinity soil : The collected weeds tolerant to salt stress were tested in the salt-affected field of Kasesart University and data are collecting to evaluate the effectiveness of herbaceous weeds in restoring vegetation and influence on the micro-envirnment including soil characteristics.