3种三角梅对干旱胁迫的响应.doc

DOI:10.11931/guihaia.gxzw201606019 干旱胁迫下3种三角梅的生理反应 丁印龙1，杨盛昌2，周群1，刘雪霞1，王振1 厦门市园林植物园，福建 厦门 361003； 2.厦门大学环境与生态学院，福建 厦门 361102 摘要：对勤花三角梅（Bougainvillea buttiana ‘Miss manila’）、樱花三角梅B. glabra ‘Imperial Delight’）和金心鸳鸯三角梅B. peruviana ‘Thimma’）3个三角梅品种幼苗进行人工干旱胁迫叶片出现下垂、皱缩、变黄、脱落，植株死亡。随着干旱时间的延长，过氧化物酶POD活性先升高后降低，而超氧化物歧化酶SOD活性则逐渐降低，降低速度因品种而异qP值降低、qN值升高，PSⅡ反应中心光化学效率(Fv/Fm)、PSⅡ潜在活性(Fv/Fo)均呈现降低。 关键词：；；叶绿素荧光 esponses of three cultivar seedlings of Bougainvillea under drought stress DING Yin-Long1, YANG Sheng-Chang2, ZHOU Qun1, LIU Xue-Xia2, WANG Zhen2 1. Xiamen Botanical Garden, Xiamen 361003, Fujian, China; 2. College of The Environment and Ecology, Xiamen University, Xiamen 361102, Fujian, China Abstract: Seedlings of Bougainvillea buttiana ‘Miss manila’, B. glabra ‘Imperial Delight’ and B. peruviana ‘Thimma’ were treated to study the physiological responses under drought stress. The results showed that the plant leaves began to droop, gradually shrink, yellow in color, and fell off, all of the treatment seedlings were died in finally under the long drought. It’s showed that the peroxidase activities (POD) were increased at beginning, and decreased finally, while the superoxide dismutase (SOD) activities were gradual decreased, but the reduction rates were different in the three cultivar seedling. The research on chlorophyll fluorescence parameters showed that qP value was decreased, qN value was increased, the photochemical efficiency of PS II reaction center (Fv/Fm) and potential activity of PS II (Fv/FO) were decreased under drought stress. Key words: Bougainvillea; drought stress; growth; chlorophyll fluorescence 基金项目：厦门市科学技术局资助项目(3502[Supported by the Scientific and Technological of Xiamen City (3502] 作者简介：丁印龙(1975-)，男，福建建宁人，硕士，主要从事园艺植物的栽培和管理，(E-mial)xmylding@163.com。 1 前言 人为活动加剧了温室气体的排放，使得全球气候逐渐变暖。温度的增高加剧了森林的蒸腾作用和土壤水分的蒸发，土壤因水分蒸发而导致的干旱提高了森林的死亡率。土壤干旱胁迫对植物的影响及其植物的响应机制是科学家们一直关注的热点之一，相关研究反映在植物光合作用、抗氧化还原酶系统、类胡萝卜素、脯氨酸、可溶性糖、蛋白质含量以及相关基因表达及调控等多个方面。 三角梅(Bougainvi