Biologia plantarum 54:89-96, 2010 | DOI: 10.1007/s10535-010-0013-3

Photosynthetic performance and acclimation of Incarvillea delavayi to water stress

Y. -F. Cai1, S. -B. Zhang1,*, H. Hu1, S. -Y. Li1
1 Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, P.R. China

The photosynthetic performance and related leaf traits of Incarvillea delavayi Bur. et Franch were studied at different water regimes to assess its capacity for photosynthetic acclimation to water stress. The initial response of I. delavayi to water stress was the closure of stomata, which resulted in down-regulation of photosynthesis. The stomatal limitation (SL) represented the main component to photosynthetic limitations but non-stomatal limitation (NSL) increased quickly with the increasing water stress, and had similar magnitude to SL under severe water stress (soil moisture 25-30 % of field capacity). Chlorophyll (Chl) a fluorescence parameters characterizing photosystem (PS) 2 photochemical efficiency (ΦPS2), electron transport rate (J) and photochemical quenching (qP) decreased with the increasing water stress, indicating impaired photosynthetic apparatus. However, the water-stressed plants had a increased mesophyll CO2 diffusional conductance, Chl a/b ratio, leaf nitrogen partitioning in RuBPCO and bioenergetics in later grown parts, indicating that I. delavay had a substantial physiological plasticity and showed a good tolerance to water stress.

Keywords: chlorophyll; fluorescence; net photosynthetic rate; nitrogen; photosynthetic limitation; RuBPCO; stomatal conductance; water stress
Subjects: chlorophyll a,b; chlorophyll fluorescence; CO2 concentration, internal; growth and growth analysis; Incarvillea dalavayi; leaf growth; mesophyll conductance; nitrogen use efficiency; photon flux density; photosynthetic limitations; photosynthetic rate; stomatal conductance; stomatal limitation; transpiration rate; water potential; water stress

Received: March 18, 2008; Accepted: December 10, 2008; Published: March 1, 2010Show citation

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Cai, Y.-F., Zhang, S.-B., Hu, H., & Li, S.-Y. (2010). Photosynthetic performance and acclimation of Incarvillea delavayi to water stress. Biologia plantarum, 54(1), 89-96. doi: 10.1007/s10535-010-0013-3.
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