【摘要】 为了筛选出适合江西省推广栽培的速生耐寒桉树,通过桉树幼苗对低温胁迫的生理反应和冻害后的形态变化来研究其抗寒能力。以引进的7种桉树(Eucalyptus spp.)1年生苗叶片为研究材料,通过人工低温处理,测定桉树相对电导率和MDA含量变化,并用Logistic方程拟合求拐点值来估计其半致死温度,结合田间冻害症状变化探讨其抗寒性。结果表明:相对电导率和MDA含量随处理温度降低而逐步升高,不同种间抗寒性存在显著差异,抗寒性从强到弱依次为:樟脑桉(E.comphora)、邓恩桉(E.dunnii)、多利桉(E.dorrigoensis)、山灰桉(E.cypellocarpa)、赤桉(E.camaldulensis)、巨桉(E.grandis)、柳桉(E.saligna)。从苗期耐寒性来看,樟脑桉和邓恩桉其耐寒性最强,可以在赣北地区试种。更多还原

【Abstract】 In this paper,to screen out Eucalyptus species which are fast-growing and cold-resistant ability for cultivation in Jiangxi province,especially in Ganbei area of Jiangxi province,their physiological reaction under low temperature stress and their morphological change after freezing injury in Eucalyptus seedling are studied.The relative electrical conductivity and MAD content of Eucalyptus were tested and analyzed with 7 one-yea-old leaves of Eucalyptus under controlled low temperature treatments.The semi-lethal temperature was determined by using Logistic equation fitting for inflection point value.The results showed that the relative electrical conductivity,MDA content increased with the lowering of the treating temperature.The cold resistance of Eucalyptus species has significant difference.It is concluded that the cold resistance order of the seven Eucalyptus at the seedling stage was E.camphora>E.dunnii>E.dorrigoensis>E.cypellocarpa>E.camaldulensis>E.grandis>E.saligna.E.camphora and E.dunnii can be planted experimentally for their cold resistance in Ganbei area of Jiangxi province.更多还原