广西植物2012，Vol.32Issue(3)：304-309,6.DOI:10.3969/j.issn.1000-3142.2012.05.004
类短命植物新疆猪牙花解剖结构及其生态适应性的研究
Anatomy and its ecological adaptation of an ephemeroid Erythronium sibiricum in Xinjiang
摘要
Abstract
Erythrornumsibiricum is an ephemeroid in Xinjiang Altai,distributing in alpine grassland under Larixsibirica Ledeb. forest with shadow habitat In the present paper,anatomy and its ecological adaptation of E. sibiricum was studied. The results showed that there was significant parenchyma in subterranean scale leaf, which provided sufficient location of water and nutriment for E. sibiricttm during its above 10-month dormancy every year;stem (scape) of E. stbiricitm consisted of epidermis,ground tissue and sparsate closed vascular bundles. There was a thick layer of cuticle on the epidermis of stem, which could save inside water from evaporation, lots of vasculars were able to ensure water absorption from cold soil and nutrients allocation to shoot efficiently. There was significant phloem fiber in every bundle that played a very important role in bearing large flower or fruit on the top of the stem; leaf was large and thin with little cuticle on the epidermis,which could not only lessen sunlight reflection,but also enlarged photosynthetic surface. Besides spongy tissue,there was another kind of special mesophyll tissue "semi-palisade tissue" in asssimilating tissue constituted with layers of elongate cells,whose macro-axis was paralle with the leaf epidermis,and it means a significantly enlarged photosynthetic tissue area,suggesting an adaptation to the shadow habitat of E. sibiricum under the forest where the sunlight was not sufficient;there were densy veins inside of the parianth,which acted as a keystone role in sustaining enough water supply,sustaining cell normal turgor pressure,sustaining optimal spatial showing pattern of parianth,and in improving pollination efficiency, ensuring reproductive success. It was also the result of the long-period adaptation of the plant to its shadow forest habitat, where the pollinators were not reliable;axile placentation with much ovules in each locule,and style was hollow,and style canal was obvious and with secretory cells on its inner epidermis,which was helpful to rapid germination of pollen and enlongation of pollen tube.关键词
新疆猪牙花/解剖/类短命植物/适应/拟栅栏组织Key words
Erythronium sibiricum/ anatomy/ ephemeroid plant/ adaptation/ semi-palisade tissue分类
农业科技引用本文复制引用
马智,马淼,赵红艳..类短命植物新疆猪牙花解剖结构及其生态适应性的研究[J].广西植物,2012,32(3):304-309,6.基金项目
国家自然科学基金(30960028) （30960028）
