Root border cells, previously referred to as sloughed root cap cells, is a special cell population which separates in large numbers from the periphery of the root cap and accumulates in the root tip. Recent evidence r...Root border cells, previously referred to as sloughed root cap cells, is a special cell population which separates in large numbers from the periphery of the root cap and accumulates in the root tip. Recent evidence reveals that border cells, whose development is regulated by endogenous and exogenous signals, are biologically viable in the majority of higher plant species. As soon as border cells detach from root cap periphery, their metabolic activity dramatically increases in accordance with a differential gene expression from that in root cap cells. Recently, PsUGT1 and RCPME1, relevant to the early and late stage of border cell development, respectively, have been cloned and functionally identified. Border cells can synthesize specially and export a diverse array of chemicals including anthocyanins, antibiotics, special enzymes and other substances, that either inhibit or promote the growth of other entities in rhizosphere such as bacteria, fungi, viruses, and nematodes, and also antagonize some toxic chemicals around the root tip in soil such as aluminum toxicity. Therefore, there are multiple biological roles played by border cells during plant growth and development.展开更多
A set of forestation decision-making system which covers 140 tree species growing extensively in Zhejiang Province including coniferous forest, broad-leaf forest, production forest, and bamboo forest, was developed by...A set of forestation decision-making system which covers 140 tree species growing extensively in Zhejiang Province including coniferous forest, broad-leaf forest, production forest, and bamboo forest, was developed by cooperation of silvicultural techniques and computer programming based on the experience of forestry management and mathematical models. It can be easily operated to help user selecting tree species in given site types and optimize their benefits, which advances the efficiency of forestation and improves the rationality of decision-making.展开更多
文摘Root border cells, previously referred to as sloughed root cap cells, is a special cell population which separates in large numbers from the periphery of the root cap and accumulates in the root tip. Recent evidence reveals that border cells, whose development is regulated by endogenous and exogenous signals, are biologically viable in the majority of higher plant species. As soon as border cells detach from root cap periphery, their metabolic activity dramatically increases in accordance with a differential gene expression from that in root cap cells. Recently, PsUGT1 and RCPME1, relevant to the early and late stage of border cell development, respectively, have been cloned and functionally identified. Border cells can synthesize specially and export a diverse array of chemicals including anthocyanins, antibiotics, special enzymes and other substances, that either inhibit or promote the growth of other entities in rhizosphere such as bacteria, fungi, viruses, and nematodes, and also antagonize some toxic chemicals around the root tip in soil such as aluminum toxicity. Therefore, there are multiple biological roles played by border cells during plant growth and development.
文摘A set of forestation decision-making system which covers 140 tree species growing extensively in Zhejiang Province including coniferous forest, broad-leaf forest, production forest, and bamboo forest, was developed by cooperation of silvicultural techniques and computer programming based on the experience of forestry management and mathematical models. It can be easily operated to help user selecting tree species in given site types and optimize their benefits, which advances the efficiency of forestation and improves the rationality of decision-making.
