The effects of resource availability and environmental conditions on genetic rankings for carbon isotope discrimination during growth in tomato and rice

被引:21
作者
Comstock, JP [1 ]
McCouch, SR
Martin, BC
Tauer, CG
Vision, TJ
Xu, YB
Pausch, RC
机构
[1] Cornell Univ, Dept Plant Breeding, Ithaca, NY 14853 USA
[2] Oklahoma State Univ, Dept Plant & Soil Sci, Stillwater, OK 74078 USA
[3] Oklahoma State Univ, Dept Forestry, Stillwater, OK 74078 USA
[4] Univ N Carolina, Dept Biol, Chapel Hill, NC 27599 USA
[5] Cornell Univ, Boyce Thompson Inst Plant Res, Ithaca, NY 14853 USA
关键词
D O I
10.1071/FP05117
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Carbon isotope discrimination (Delta) is frequently used as an index of leaf intercellular CO2 concentration (c(i)) and variation in photosynthetic water use efficiency. In this study, the stability of Delta was evaluated in greenhouse-grown tomato and rice with respect to variable growth conditions including temperature, nutrient availability, soil flooding ( in rice), irradiance, and root constriction in small soil volumes. Delta exhibited several characteristics indicative of contrasting set-point behaviour among genotypes of both crops. These included generally small main environmental effects and lower observed levels of genotype-by-environment interaction across the diverse treatments than observed in associated measures of relative growth rate, photosynthetic rate, biomass allocation pattern, or specific leaf area. Growth irradiance stood out among environmental parameters tested as having consistently large main affects on Delta for all genotypes screened in both crops. We suggest that this may be related to contrasting mechanisms of stomatal aperture modulation associated with the different environmental variables. For temperature and nutrient availability, feedback processes directly linked to c(i) and / or metabolite pools associated with c(i) may have played the primary role in coordinating stomatal conductance and photosynthetic capacity. In contrast, light has a direct effect on stomatal aperture in addition to feedback mediated through c(i).
引用
收藏
页码:1089 / 1105
页数:17
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