Bioresources of northern part of Vietnam Bi-directional estimation of environmental adaptability of crop genetic resources.

在这个项目中，为了估算越南北部的生物资源，我们进行了1。越南北部遗传资源的收集；遗传资源的环境适应性评价，并讨论了越南北部生物多样性的保护、现有遗传资源的开发和可持续农业的前景。作物遗传资源的收集我们于2004年和2005年访问了越南山区，山腊、奠边胡、北河、沙帕、老凯和高坂。然后对该地区的种植制度进行了调查，收集了水稻、旱稻、豆类、荞麦、大豆等70个品种的遗传资源。作物遗传资源环境适应性评价(1)基于根系穿透能力的水稻抗旱性评价以越南旱稻和粳稻、粳稻和籼稻为研究对象，研究了基于根系穿透能力的水稻抗旱性。越南旱稻具有较高的抗旱潜力(2)杂交水稻VL20营养期生长特性及光合潜力评价VL20的抽穗期比亲本短10 d，但产量潜力与亲本（103和R20）相当。研究了杂交水稻VL20营养期的生长特征和光合势。播后5周，VL20的作物生长速率显著高于亲本，说明初期的积极生长导致了短时间内较高的干物质产量。VL20保持了较高的光合速率，说明VL20具有叶片衰老缓慢、光合潜力优越的特点。

In this project, for estimation of bioresources of north Vietnam, we conducted 1. collection of genetic resources in north Vietnam and 2. evaluation pf environmental adaptability of genetic resources, and discussed preservation of bio-diversity in north Vietnam, development of available genetic resources and outlook of sustainable agriculture.1. Collection of crop genetic resourcesWe visited mountain area of Vietnam, Son La, Dien Bien Hoo, Bac Ha, Sapa, Lao Kai and Kao Ban) in 2004 and 2005. Then, cropping systems of these area were investigated, and we collected llspecies 70 varieties of genetic resources, including paddy rice, upland rice, legumes buckwheat and so.2. Evaluation of environmental adaptability of crop genetic resources(1) Evaluation of drought tolerance based on the ability of root penetration in riceWe investigated drought tolerance based on the ability of root penetration using different type of rice, upland rice of Vietnam and Japonica, and paddy rice of Japonica and Indica. Higher potential of drought tolerance was found in upland rice in Vietnam(2) Evaluation of growth feature and photosynthetic potential of hybrid rice VL20 during vegetative stageHybrid rice, VL20, has same level yield potential as compared to its parents (103s and R20) though duration to heading in VL20 is 10 days shoter than that in its parents. We investigated growth feature and photosynthetic potential of hybrid rice, VL20,during vegetative stage. In five weeks after sowing, crop growth rate in VL20 was significant higher than that in its parents which indicated that active growth of the beginning stage induced to higher dry matter production during shorter duration. Higher level of photosynthetic rate in VL20 was kept, which suggested that VL20 has feature of slow leaf senescence and superior photosynthetic potential as compared to its parents.