LEAF ANATOMICAL STRUCTURE AND PHOTOSYNTHETIC PHYSIOLOGICAL CHARACTERISTICS OF C4 DESERT SPECIES SALSOLA COLLINA ANDS. ARBUSCULA

doi:10.3773/j.issn.1005-264x.2009.02.012

Abstract

Abstract:

Aims We studied the physiological and ecological characteristics of Salsola collina and S. arbuscula in order to provide a theoretical basis for understanding their physiological and ecological mechanisms of adaptation to their habitats.

Methods We chose representative plants and collected mature leaves for anatomical structure analysis, measured leaf gas exchange parameters under natural conditions in their mixed community and compared drought structures and photosynthetic characteristics of the two species.

Important findings Salsola collina leaves had epidermal hairs and more developed water storage parenchyma. Salsola arbuscula leaves had thicker cuticles with a layer of hypodermal cells under them, and the palisade cells were longer and arranged more densely. The net photosynthetic rate of S. collina was significantly higher than that of S. arbuscula, with daily mean values of 21.5 and 15.7 μmol CO₂·m^-2·s^-1, respectively. The transpiration rate of S. collina was also higher than S. arbuscula, with daily mean values of 14.9 and 10.2 mmol·m^-2·s^-1, respectively. The daily mean values of water use efficiency of S. collina and S. arbuscula were 1.39 and 1.53 μmol CO₂·mmol^-1H₂O, respectively; especially at 14:00, they were 1.61 and 2.30 μmol CO₂·mmol^-1H₂O, respectively,S. arbuscula was 42% higher than S. collina approximately. The light compensation point and CO₂ compensation point of S. collina were lower and its light saturation point and photo-quantum efficiency were higher than S. arbuscula. These findings indicate that the drought structures of the two species are different, and S. arbuscula has more desert plant features. In the community suitable for the growth of both species, the photosynthetic capacity of S. collina was stronger than S. arbuscula, and the water use efficiency of S. arbuscula was higher.

Key words: Salsola collina, Salsola arbuscula, photosynthesis, C₄desert species

GAO Song, SU Pei-Xi, YAN Qiao-Di, DING Song-Shuang, ZHANG Ling-Mei. LEAF ANATOMICAL STRUCTURE AND PHOTOSYNTHETIC PHYSIOLOGICAL CHARACTERISTICS OF C₄ DESERT SPECIES SALSOLA COLLINA ANDS. ARBUSCULA[J]. Chin J Plant Ecol, 2009, 33(2): 347-354.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2009.02.012

https://www.plant-ecology.com/EN/Y2009/V33/I2/347

Figures/Tables 5

Figs. 1–4 Transverse sections of leaves of Salsola collina and S. arbuscula under light microscope

Fig. 5 Daily changes of meterological factors

Fig. 6 Daily changes of net photosynthetic rate, transpiration rate, stomatal conductance and water use efficiency

Fig. 7 Responses of net photosynthetic rate of two desert species to different photosynthetically available radiations (PAR) and CO2 concentrations

Table 1 Photosynthetic and physiological parameters in the leaves of Salsola collina and S. arbuscula

植物种 Species	光补偿点 Light compensation point (μmol·m^-2·s^-1)	光饱和点 Light saturation point (μmol·m^-2·s^-1)	表观量子效率 Apparent quantum yield (mol·mol^-1)	暗呼吸速率 Dark respiration (μmol CO₂·m^-2·s^-1)	CO₂补偿点 CO₂ compensation point (μmol·mol^-1)
猪毛菜 Salsola collina	152***	–	0.085***	14.3***	7**
木本猪毛菜 S. arbuscula	220***	1 820***	0.045***	10.2***	9**

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LEAF ANATOMICAL STRUCTURE AND PHOTOSYNTHETIC PHYSIOLOGICAL CHARACTERISTICS OF C₄ DESERT SPECIES SALSOLA COLLINA ANDS. ARBUSCULA

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