检索结果-南通市图书馆

Seeds as a Source of Carbon, Nitrogen, and Phosphorus for Seedling Establishment in Temperate Regions: A Synthesis

American Journal of Plant Sciences 2013年第5期4卷 30-40页

作者： Byron B. Lamont Philip K. Groom Department of Environment and Agriculture Curtin University Perth Australia.

Seeds are a source of organic (carbon, C) and mineral (nitrogen, N and phosphorus, P) nutrients for the growing seedling. There is much information on seed mass and N and P contents, and the relationship between these and seedling mass. Within the world’s temperate regions, these collectively show that N and P concentrations remain constant or rise with increase in seed mass and that seeds are larger and more nutrient-enriched in poorer soils. Seed N and P were more important than seed C in accounting for seedling mass in 85% of studies we assessed. In nutrient- and water-limited environments that are not light-limited, large seeds routinely provision the seedling with N and P that enhance C-fixation and thus general growth in the first wet season. This system is so efficient that growth response to soil nutrients may be negligible in first-year seedlings arising from seeds > 15 mg mass, N content > 5 mg and P content > 1.6 mg. The elongating taproot system absorbs nutrients and maintains water uptake as soil water retreats, enhancing the chances of survival in the first dry season. We outline an interpretative scenario for the special role of large seeds (>15 mg) in nutrient- and water-limited environments that recognizes the critical role of N and P for photosynthesis in ensuring sufficient C-supply to the rapidly descending roots for effective drought-avoidance by the young plant.

关键词： Cotyledons drought-avoidance Nutrient Transport Photosynthesis Root Elongation Seed Mass Seed Nutrient Content Seedling Growth

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Adaption to contrasting soil water conditions drives upland and lowland rice differentiation

Adaption to contrasting soil water conditions drives upland ...

引用

2013全国植物生物学大会

作者： XIA Hui ZHENG Xiaoguo CHEN Liang KOU Zhikui GAO Huan MA Xiaosong LONG Ping LI Jiajia LUO Lijun Shanghai Agrobiological Gene Center

drought is one of the most harmful abiotic stresses to rice *** is very urgent for us to improve water-saving and drought-resistant characters in ***,the knowledge of evolution of drought-resistance in rice is *** this study,upland rice and lowland rice,two important rice ecotypes adapted to contrasting soil water conditions,were involved to investigated the evolution of drought-resistance during their *** outlier loci were detected between upland and lowland *** upland-lowland rice differentiation on these outlier loci were found in japonica(Fst=0.258) and indica(Fst= 0.127) *** selections on drought-resistant traits was revealed by higher Qst of drought-resistant traits than the neutral Fst between upland and lowland ***,the genetic distance matrix from outlier loci were significantly correlated with that from differentiated drought-resistant traits,suggesting that upland-lowland rice differentiation was driven by divergent selections on *** upland-and lowland-specific alleles responded differently between ecotypes or allelic types when encountering osmotic stress,showing signs of drought-resistance evolution at expression *** is noteworthy the drought resistance could be independently evolved in japonica and *** conclusion,genetic differentiation of upland and lowland rice was associated with divergent selections on drought-related *** findings could strengthen our understanding of the drought resistance evolution in rice with implications in rice drought-resistance improvement.

关键词： adaptive divergence drought stress rice ecotype drought-avoidance droughttolerance drought-responding EST-SSR

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：