Survey for genetic resources in tropical rootcrops in relation to drought resistance

与抗旱相关的热带块根作物遗传资源调查

基本信息

批准号：
13575032
负责人：
YAMAUCHI Akira
金额：
$ 8.19万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13575032/
关键词：
Ipomoea batatas Cassava Manihot esculenta Grants Water use Water stress Water use efficiency Sweetpotato Drouoht tolerance Manihot esculenta Crantz 根

项目摘要

This research was conducted in collaboration with Philippine Root Crop Research and Training Center, Leyte State University to evaluate genotypic variation in cassava and sweetpotato in drought tolerance and to identify the traits that are closely related to the tolerance. In addition to the collection of the Center, we further collected a number of genotypes from several drought-prone areas m the Philippines.Sevearl surveys among the rootcrop growing Canners indicated that the question on decision-making strategies by farmers on sustained adoption of a variety is different from the question of preference to grow a certain variety. The former involves more than just traits preference ; and includes other considerations, such as resources, availability of planting materials, use and market, perceived or actual physical or environmental constraints, etc., which is a subject for futher study.Under water stress, dry matter is a product of water use (WU) and water use efficiency (WUE). Based. on this concept, the growth responses of 28 cassava genotypes and 18 sweelpotato genotypes to water stress were examined in a series of pot experimentsIn cassava, drought significantly reduced dry matter production. Results of a correlation analysis indicate that the genotypic variation in dry matter response to drought was better explained by that in WUE than in WU. In sweetpotato, dry matter production was also significantly reduced in droughted plants. The drought treatment significantly reduced WU, while it scarcely affected WUE. These facts clearly show that the reduction of WU but not WUE caused dry matter reduction, which is opposite to the case of cassava.The results of a series of field experiments generally support those obtained by the pot experiments, which are necessary to validated by the evaluation of Genotype x Environment Interaction in further study.

这项研究是与莱特州立大学菲律宾块根作物研究和培训中心合作进行的，旨在评估木薯和甘薯耐旱性的基因型变异，并确定与耐旱性密切相关的性状。除了中心的收集外，我们还从菲律宾的几个干旱易发地区收集了一些基因型。对块根作物种植坎纳的多项调查表明，农民持续采用品种的决策策略问题与偏好种植某种品种的问题不同。前者不仅仅涉及特质偏好；并包括其他考虑因素，例如资源、种植材料的可用性、用途和市场、感知或实际的物理或环境限制等，这是进一步研究的主题。在水分胁迫下，干物质是水利用的产物（ WU) 和水分利用效率 (WUE)。基于。根据这一概念，通过一系列盆栽实验检查了 28 种木薯基因型和 18 种甘薯基因型对水分胁迫的生长反应。在木薯中，干旱显着降低了干物质产量。相关分析结果表明，WUE 中的干物质对干旱响应的基因型变化比 WU 中的基因型变化更好地解释。在甘薯中，干旱植物的干物质产量也显着减少。干旱处理显着降低WU，但几乎不影响WUE。这些事实清楚地表明，WU的减少而不是WUE的减少导致了干物质的减少，这与木薯的情况相反。一系列田间试验的结果基本支持盆栽试验获得的结果，这需要通过盆栽试验来验证。进一步研究中评估基因型 x 环境相互作用。