南京林业大学学报（自然科学版）2024，Vol.48Issue(2)：45-50,6.DOI:10.12302/j.issn.1000-2006.202204017
当年和越年生香榧叶片的光合效率及抗氧化特性的季节性变化
Seasonal variations in photosynthetic efficiency and antioxidant characteristics of the current and one year-old leaves in Torreya grandis'Merrillii'
摘要
Abstract
[Objective]Determination of seasonal changes in chlorophyll fluorescence parameters,antioxidant enzymes,malondialdehyde(MDA)and other parameters in current and 1 year-old leaves of Torreya grandis'Merrillii'was to study the adaptive mechanism of the photosynthetic characteristics of T.grandis'Merrillii'leaves to temperature changes during season.[Method]The chlorophyll fluorescence parameters,specific leaf weight(SLW),antioxidant enzyme activity and soluble protein changes of T.grandis'Merrillii'leaves were measured in May,June,August,November and January of the second year.[Result](1)Compared with mid-May,ΦPSⅡ of T.grandis'Merrillii'leaves in mid-August was significantly up-regulated,while ΦNPQ was significantly down-regulated,and ΦNO with little change.SOD and CAT activities in T.grandis'Merrilli'current leaves were significantly increased,POD activity was significantly decreased,and MDA with little change.(2)Compared with mid-November,the average temperature in January of the second year decreased by nearly 10 ℃.ΦPSⅡ and ΦNPQ of T.grandis'Merrillii'current leaves and one-year old leaves decreased significantly,while their ΦNo and MDA content increased significantly.[Conclusion]Compared with mid-May,T.grandis'Merrillii'current leaves and one-year old leaves markedly improved ΦPS Ⅱ in mid-August is due to the high temperature and its leaves to absorb more light,and used for electron transfer,less dissipation of energy in the form of heat,the photosynthetic photoinhibition not occurring,its strong antioxidant enzyme system can coordinate to help them adapt to the high temperature specular environment.Compared with mid-November,T.grandis'Merrillii'current leaves and one-year old leaves suffered cold damage during overwintering in mid-January of the second year,and the photosynthetic organs of leaves suffered light damage.Above all,T.grandis'Merrillii'leaves are resistant to heat weather but not to cold weather,which may be the limiting factor of northern expansion.关键词
香榧/叶龄/抗氧化酶/光合特性/季节性变化Key words
Torreya grandis'Merrillii'/different leaf age/antioxidant enzymes/photosynthetic characteristics/seasonal change分类
农业科技引用本文复制引用
赵晓龙,沈家怡,刘涛,吴家胜,胡渊渊..当年和越年生香榧叶片的光合效率及抗氧化特性的季节性变化[J].南京林业大学学报（自然科学版）,2024,48(2):45-50,6.基金项目
国家自然科学基金区域创新发展联合基金(U20A2049) （U20A2049）
国家自然科学面上基金项目(32271922). （32271922）
