title: [Photosynthetic and water physiological characteristics of weedy rice in northern China].
abstract: Weedy rice is an important germplasm source of rice, which has the characteristics of cold-, drought-, and barren tolerance. Taking 88 accessions of weedy rice and 4 varieties of cultivated rice in northern China as test materials, this paper studied the photosynthetic characteristics (photosynthetic rate, transpiration rate, and stomatal conductance), water physiological characteristics, and their interrelationships of weedy rice in northern China. There existed greater differences in the photosynthetic and water physiological characteristics among the weedy rice accessions, possessing abundant diversity. The photosynthetic rate of the accessions was from 12.47 micromol CO2 x m(-2) x s(-1) to 28.67 micromol CO2 X m(-2) x s(-1), and the instantaneous water use efficiency was from 1.39 mg x g(-1) to 3.40 mg x g(-1). Among the photosynthetic parameters, intercellular CO2 concentration had the smallest variable coefficient, while stomatal conductance had the largest one. The photosynthetic rate had significant conic relationships with transpiration rate and stomatal conductance, and had a linear relationship with intercellular CO2 concentration. The significant conic relationships also existed between the instantaneous water use efficiency and the transpiration rate and stomatal conductance. The excellent features of weedy rice could be used to improve the cultivated rice varieties.
authors.affiliation: Rice Research Institute/Key Laboratory of Northeast Rice Biology and Breeding, Ministry of Agriculture/Key Laboratory of Northern Japonica Super Rice Breeding, Ministry of Education, Shenyang Agricultural University, Shenyang 110866, China. gaoqi20113@126.com
authors.forename: Qi
authors.initials: Q
authors.lastname: Gao
authors.affiliation: Rice Research Institute/Key Laboratory of Northeast Rice Biology and Breeding, Ministry of Agriculture/Key Laboratory of Northern Japonica Super Rice Breeding, Ministry of Education, Shenyang Agricultural University, Shenyang 110866, China.
authors.forename: Dian-Rong
authors.initials: DR
authors.lastname: Ma
authors.affiliation: Rice Research Institute/Key Laboratory of Northeast Rice Biology and Breeding, Ministry of Agriculture/Key Laboratory of Northern Japonica Super Rice Breeding, Ministry of Education, Shenyang Agricultural University, Shenyang 110866, China.
authors.forename: De-Xiu
authors.initials: DX
authors.lastname: Kong
authors.affiliation: Rice Research Institute/Key Laboratory of Northeast Rice Biology and Breeding, Ministry of Agriculture/Key Laboratory of Northern Japonica Super Rice Breeding, Ministry of Education, Shenyang Agricultural University, Shenyang 110866, China.
authors.forename: Wen-Jia
authors.initials: WJ
authors.lastname: Wang
authors.affiliation: Rice Research Institute/Key Laboratory of Northeast Rice Biology and Breeding, Ministry of Agriculture/Key Laboratory of Northern Japonica Super Rice Breeding, Ministry of Education, Shenyang Agricultural University, Shenyang 110866, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Tong
authors.affiliation: Rice Research Institute/Key Laboratory of Northeast Rice Biology and Breeding, Ministry of Agriculture/Key Laboratory of Northern Japonica Super Rice Breeding, Ministry of Education, Shenyang Agricultural University, Shenyang 110866, China.
authors.forename: Ming-Hui
authors.initials: MH
authors.lastname: Zhao
authors.affiliation: Rice Research Institute/Key Laboratory of Northeast Rice Biology and Breeding, Ministry of Agriculture/Key Laboratory of Northern Japonica Super Rice Breeding, Ministry of Education, Shenyang Agricultural University, Shenyang 110866, China.
authors.forename: Zheng-Jin
authors.initials: ZJ
authors.lastname: Xu
authors.affiliation: Rice Research Institute/Key Laboratory of Northeast Rice Biology and Breeding, Ministry of Agriculture/Key Laboratory of Northern Japonica Super Rice Breeding, Ministry of Education, Shenyang Agricultural University, Shenyang 110866, China.
authors.forename: Wen-Fu
authors.initials: WF
authors.lastname: Chen
mesh_terms: D002681:China; D017753:Ecosystem; D014644:Genetic Variation; D012275:Oryza / Q000145:classification* / Q000502:physiology*; D010788:Photosynthesis / Q000502:physiology*; D014867:Water / Q000502:physiology*
chemical_list: D014867:Water