教学课程资源库 更多>>

关键词： DNA甲基化   DNA甲基化转移酶   MBPs  

摘要： DNA的甲基化修饰在基因表达、植物细胞分化和植物的系统发育中起着重要的调节作用.从DNA甲基化机理、调节机制及其在植物生长发育中的意义3个方面阐述了DNA甲基化的研究进展.

关键词： 丙酮酸磷酸双激酶   分子生物学   基因工程   研究进展  

摘要： 丙酮酸磷酸双激酶是C4光合途径中的专一性酶,在C4光合作用中起着重要作用。综述了植物丙酮酸磷酸双激酶基因结构、基因进化、表达调控机理,概述了植物丙酮酸磷酸双激酶基因工程在植物光合生理方面的研究进展。

关键词： 千果榄仁   生物学特性   迁地保护  

摘要： 千果榄仁（Terminalia myriocarpa）是我国热带、南亚热带地区的优良乡土阔叶树种，具有较高的经济价值。花期为9月下旬至10月初，果熟期为11月下旬至翌年2月；新鲜种子发芽率仅约30％；培育千果榄仁裸根苗约1年，苗高80cm以上，地径0．7cm以上，可出圃造林；采用2m×2m的株行距造林，前2～3年每年抚育2～3次可成林。

关键词： 气孔   植物   基本知识   气孔运动  

ISBN: (纸本)9787564900427

摘要： 本书系统介绍了植物气孔结构、气孔代谢、气孔运动和气孔发育等有关内容。全书共分十章。主要包括: 气孔的分布、大小和类型、气孔代谢的特点以及气孔代谢与气孔运动的关系等。

关键词： Travelling waves   Time delay integro-differential equations   Measure kernel convolution  

摘要： In this work several models of fungal disease propagation are considered. They consist of reaction-diffusion systems coupled with ordinary differential equations with or without time delay as well as integro-differential system of equations. We derive some conditions that ensure the existence and uniqueness of travelling wave solutions for these various models. Our proof is based on a suitable re-formulation in the form of a nonlinear integral equation with measure kernel convolutions. (c) 2008 Elsevier Ltd. All rights reserved.

关键词： Disanthus cercidifolius Maxim. var. longipes HTChang   pollen limitation   pollination efficiency   reproductive assurance role   reproductive strategy  

摘要： Disanthus cercidifolius Maxim. var. longipes H.T. Chang usually has two inflorescences growing in opposite directions in the axillae, but occasionally three inflorescences grow paratactically. The typical flowering process could be divided into 4 periods: "Pre-dehiscence", "Initial dehiscence", "Full dehiscence" and "Withering". Both the natural population and the planted population had a flowering peak of 15-35 days after the first flower bloomed. There were significant differences between the time courses of flowering of the two populations. Out-crossing is the main breeding system in this species. And autogamy decreases the risk of reproductive failure of this species. The main insect pollinators of D. cercidifolius var. longipes are Episyrphus balteatus de Geer, Scaptodrosophila coracina Kikkawa and Peng, Polistes olivaceus de Geer, Apis cerana Fabricius, Nezara viridula L. and Coccinella septempunctata L., and so on. Among the insects, S. coracina and E. balteatus are the most important and efficient pollinators, but others are inefficient pollinators. Though wind pollination is not efficient, it guarantees reproduction when insect pollinators are not available. "Mass flowering" is an adaptive behavior and reproductive strategy of this species, and "few fruiting" could be caused by the lack of pollinators.

关键词： AFLP   Atlantic   Cakile maritima   coastal plant species   Eryngium maritimum   gene flow   genetic structure   Mediterranean   sea currents  

摘要： Aim We investigate the geographical genetic structure of two coastal plant species, Cakile maritima Scop. (Brassicaceae) and Eryngium maritimum L. (Apiaceae), through three sea straits and along one continuous stretch of coast using amplified fragment length polymorphisms (AFLPs). The two species have a similar ecology in that they grow in sandy habitats, but differ in life-form (annual vs. perennial) and dispersability of seeds by sea water as inferred from floating experiments. The sea straits differ in their geological history and their modern current systems. The primary goal of our study was to test the hypothesis that sea straits have an influence on the geographical patterns of genetic variation at the population level. Location The areas around the Strait of Gibraltar, the Dardanelles, the Bosporus and the Atlantic coast of western France. Methods For both species we investigated AFLP variation in several populations from each area. Bayesian clustering and diversity and differentiation measures were used to analyse the genetic data. Results In most areas the spatial genetic structure was similar between the two species. They share the presence of distinct genetic gaps along the coast through the Strait of Gibraltar and the Bosporus, and these genetic gaps coincide with the straits. Both species show genetic continuity along the coast of western France. A distinct genetic gap was found through the Dardanelles for C. maritima but not for E. maritimum. Main conclusions The study shows that sea straits have an influence on the geographical patterns of genetic variation. Sea currents are inferred to cause the genetic gap through the Strait of Gibraltar. In the Bosporus and, for C. maritima, through the Dardanelles, the genetic gaps found are explained by the past closure of these two straits as well as by present-day factors. Simulations indicate that the lower differentiation of C. maritima through the Dardanelles than through the Bosporus cannot be explained by

关键词： 激光生物学   应用   植物育种  

ISBN: (纸本)9787811315073

摘要： 本书首先简要的介绍光的基本知识、激光形成的原理、激光器的主要类别；其次介绍激光在不同领域中的应用，特别是激光与植物有机体相互作用效应、激光在农业上的应用；最后介绍如何利用激光进行植物育种。

关键词： Pharmaceutical Preparations   Medicine   biology   Biological Science Disciplines   Magazines   journals  

摘要： The Journal of Plant Research (JPR), has been chosen by the Biomedical and Life Science Division of the Special Libraries Association (SLA) as one of the 100 most influential journals in biology and medicine over the last 100 years. The JPR is the sole journal nominated from Japan.

关键词： 矿质营养   自由基   生物学研究   植物营养  

摘要： 自由基是生物体代谢产生的有氧化作用的一类活性物质,它的产生和活性受到多种因素的影响。本文系统介绍了自由基在植物体内产生的过程及其对植物体产生的影响,重点对矿质养分与自由基的关系进行系统的阐述,为植物营养发展方向提供有益的参考。