摘要
为了探讨干旱胁迫对长春花的生长繁殖、光合特性及可溶性糖的影响,测定不同土壤湿度下的长春花幼苗叶片的净光合速率、蒸腾速率、气孔导度、糖含量等生理指标及叶片数、株高、花数等形态指标。结果表明:轻度干旱胁迫下(土壤体积相对含水量55%～60%),其生理及形态方面均没有发生明显的变化;重度干旱胁迫下(土壤体积相对含水量30%～35%),长春花的营养生长及生殖生长均受到明显的抑制,净光合速率、蒸腾速率、气孔导度显著下降的同时,水分利用率明显升高,这表明长春花具有强抗旱性;中度干旱下(土壤体积相对含水量40%～45%)使长春花由营养生长向生殖生长过渡,蔗糖的积累起到了促进作用。中度和重度干旱胁迫下,可溶性糖含量大量积累提高了植株的渗透势,其中蔗糖和葡萄糖为主要的渗透调节物质。
Net photosynthetic rate, transpiration rate, stomatal eoncluctivity, sugar content, leat quantity, individual plant height, flower quantity of Catharanthus roseus were determined under different soil relative water contents（RWC） in order to study the effects of drought stress on soluble sugars, photosynthetic characteristic and growth of C. roseus. Results indi- cate that there are no obvious changes in the physiological and morphological characteristics of C. roseus under mild drought stress （ RWC = 55% -60% ）, while the vegetative and reproductive growth of C. roseus are obviously inhibited under severe drought stress （RWC = 30%-35% ）. The net photosynthetic rate, transpiration rat and stomatal conductivity all markedly decline and water use efficiency increases significantly under severe drought stress, indicating that C. roseus has strong drought stress tolerance. The transition from vegetative growth to reproductive growth occurs under moderate drought stress （ RWC=40% -45% ）, and the accumulation of sucrose plays a promotive role during this transition. The accumulation of soluble sugars enhances the osmosis of the plant cells under moderate and severe drought stress, and sucrose and glucose are the main osmotic adjustment substances.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2010年第8期54-56,共3页
Journal of Northeast Forestry University
关键词
干旱胁迫
光合作用
可溶性糖
长春花
Drought stress
Photosynthesis
Soluble sugars
Catharanthus roseus
