NITROGEN-FIXATION (C2H2 REDUCTION) BY BROAD BEAN (VICIA-FABA L) NODULES AND BACTEROIDS UNDER WATER-RESTRICTED CONDITIONS

被引:68
作者
GUERIN, V [1 ]
TRINCHANT, JC [1 ]
RIGAUD, J [1 ]
机构
[1] UNIV NICE SOPHIA ANTIPOLIS,BIOL VEGETALE & MICROBIOL LAB,CNRS,URA 79,PARC VALROSE,F-06034 NICE,FRANCE
关键词
D O I
10.1104/pp.92.3.595
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Water potentials of leaves and nodules of broad bean (Vicia faba L.) cultivated on a sandy mixture were linearly and highly (r2 = 0.99) correlated throughout a water deprivation of plants. A decrease of 0.2 megapascal of the nodule water potential (Ψnod) induced an immediate 25% inhibition of the highest level of acetylene reduction of broad bean nodules attached to roots. This activity continued to be depressed when water stress increased, but the effect was less pronounced. Partial recovery of optimal C2H2 reduction capacity of mildly water stressed nodules (Ψnod = -1.2 megapascals) was possible by increasing the external O2 partial pressure up to 60 kilopascals. The dense packing of the cortical cells of nodules may be responsible for the limitation of O2 diffusion to the central tissue. Bacteroids isolated from broad bean nodules exhibited higher N2 fixation activity with glucose than with succinate as an energy-yielding substrate. Bacteroids from stressed nodules appeared more sensitive to O2, and their optimal activity declined with increasing nodule water deprivation. This effect could be partly due to decreased bacteroid respiration capacity with water stress. Water stress was also responsible for a decrease of the cytosolic protein content of the nodule and more specifically of leghemoglobin. The alteration of the bacteroid environment appears to contribute to the decline in N2 fixation under water restricted conditions.
引用
收藏
页码:595 / 601
页数:7
相关论文
共 26 条
[1]   DROUGHT AND FLOODING EFFECTS ON N-2 FIXATION, WATER RELATIONS, AND DIFFUSIVE RESISTANCE OF SOYBEAN [J].
BENNETT, JM ;
ALBRECHT, SL .
AGRONOMY JOURNAL, 1984, 76 (05) :735-740
[2]   KINETIC STUDIES OF NITROGENASE FROM SOYBEAN ROOT-NODULE BACTEROIDS [J].
BERGERSEN, FJ ;
TURNER, GL .
BIOCHEMICAL JOURNAL, 1973, 131 (01) :61-75
[3]  
Bergersen FJ., 1982, ROOT NODULES LEGUMES
[4]  
BIROT AM, 1983, PHYSIOL VEG, V21, P715
[5]  
BRADFORD MM, 1976, ANAL BIOCHEM, V72, P248, DOI 10.1016/0003-2697(76)90527-3
[6]   NITROGENASE ACTIVITY, PHOTOSYNTHESIS AND NODULE WATER POTENTIAL IN SOYBEAN PLANTS EXPERIENCING WATER-DEPRIVATION [J].
DURAND, JL ;
SHEEHY, JE ;
MINCHIN, FR .
JOURNAL OF EXPERIMENTAL BOTANY, 1987, 38 (187) :311-321
[7]   NODULE ACTIVITY AND ALLOCATION OF PHOTOSYNTHATE OF SOYBEAN DURING RECOVERY FROM WATER-STRESS [J].
FELLOWS, RJ ;
PATTERSON, RP ;
RAPER, CD ;
HARRIS, D .
PLANT PHYSIOLOGY, 1987, 84 (02) :456-460
[8]   WATER-STRESS EFFECTS ON CO2 ASSIMILATION, PHOTOSYNTHATE PARTITIONING, STOMATAL-RESISTANCE, AND NODULE ACTIVITY IN SOYBEAN [J].
FINN, GA ;
BRUN, WA .
CROP SCIENCE, 1980, 20 (04) :431-434
[9]   METABOLIC RESPONSES OF MESOPHYTES TO PLANT WATER DEFICITS [J].
HANSON, AD ;
HITZ, WD .
ANNUAL REVIEW OF PLANT PHYSIOLOGY AND PLANT MOLECULAR BIOLOGY, 1982, 33 :163-203
[10]   LIMITATION OF ACETYLENE-REDUCTION (NITROGEN-FIXATION) BY PHOTOSYNTHESIS IN SOYBEAN HAVING LOW WATER POTENTIALS [J].
HUANG, CY ;
BOYER, JS ;
VANDERHOEF, LN .
PLANT PHYSIOLOGY, 1975, 56 (02) :228-232