Water adaptive traits of deep-rooted C3 halophyte (Karelinia caspica (Pall.) Less.) and shallow-rooted C4 halophyte (Atriplex tatarica L.) in an arid region, Northwest China
1 College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China; 2 Department of Resources and Environmental Science, Shihezi University, Shihezi 832000, China
Water adaptive traits of deep-rooted C3 halophyte (Karelinia caspica (Pall.) Less.) and shallow-rooted C4 halophyte (Atriplex tatarica L.) in an arid region, Northwest China
1 College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China; 2 Department of Resources and Environmental Science, Shihezi University, Shihezi 832000, China
摘要 This paper focused on the water relations of two halophytes differing in photosynthetic pathway, phe-notype, and life cycle: Karelinia caspica (Pall.) Less. (C3, deep-rooted perennial Asteraceae grass) and Atriplex tatarica L. (C4, shallow-rooted annual Chenopodiaceae grass). Gas exchange, leaf water potential, and growth characteristics were investigated in two growing seasons in an arid area of Xinjiang to explore the physiological adaptability of the two halophytes. Both K. caspica and A. tatarica showed midday depression of transpiration, in-dicating that they were strong xerophytes and weak midday depression types. The roots of A. tatarica were con-centrated mainly in the 0–60 cm soil layer, and the leaf water potential (YL)) increased sharply in the 0–20 cm layer due to high soil water content, suggesting that the upper soil was the main water source. On the other hand, K. caspica had a rooting depth of about 1.5 m and a larger root/shoot ratio, which confirmed that this species uptakes water mainly from deeper soil layer. Although A. tatarica had lower transpiration water consumption, higher water use efficiency (WUE), and less water demand at the same leaf water potential, it showed larger water stress impact than K. caspica, indicating that the growth of A. tatarica was restricted more than that of K. caspica when there was no rainfall recharge. As a shallow-rooted C4 species, A. tatarica displayed lower stomatal conductance, which could to some extent reduce transpiration water loss and maintain leaf water potential steadily. In contrast, the deep-rooted C3 species K. caspica had a larger root/shoot ratio that was in favor of exploiting groundwater. We concluded that C3 species (K. caspica) tapes water and C4 species (A. tatarica) reduces water loss to survive in the arid and saline conditions. The results provided a case for the phenotype theory of Schwinning and Ehleringer on halophytic plants.
Abstract: This paper focused on the water relations of two halophytes differing in photosynthetic pathway, phe-notype, and life cycle: Karelinia caspica (Pall.) Less. (C3, deep-rooted perennial Asteraceae grass) and Atriplex tatarica L. (C4, shallow-rooted annual Chenopodiaceae grass). Gas exchange, leaf water potential, and growth characteristics were investigated in two growing seasons in an arid area of Xinjiang to explore the physiological adaptability of the two halophytes. Both K. caspica and A. tatarica showed midday depression of transpiration, in-dicating that they were strong xerophytes and weak midday depression types. The roots of A. tatarica were con-centrated mainly in the 0–60 cm soil layer, and the leaf water potential (YL)) increased sharply in the 0–20 cm layer due to high soil water content, suggesting that the upper soil was the main water source. On the other hand, K. caspica had a rooting depth of about 1.5 m and a larger root/shoot ratio, which confirmed that this species uptakes water mainly from deeper soil layer. Although A. tatarica had lower transpiration water consumption, higher water use efficiency (WUE), and less water demand at the same leaf water potential, it showed larger water stress impact than K. caspica, indicating that the growth of A. tatarica was restricted more than that of K. caspica when there was no rainfall recharge. As a shallow-rooted C4 species, A. tatarica displayed lower stomatal conductance, which could to some extent reduce transpiration water loss and maintain leaf water potential steadily. In contrast, the deep-rooted C3 species K. caspica had a larger root/shoot ratio that was in favor of exploiting groundwater. We concluded that C3 species (K. caspica) tapes water and C4 species (A. tatarica) reduces water loss to survive in the arid and saline conditions. The results provided a case for the phenotype theory of Schwinning and Ehleringer on halophytic plants.
The National Basic Research Program of China (2009CB825101) and the Specialized Re-search Fund for the Doctoral Program of Higher Education of China (20110008110035).
通讯作者:
PinFang LI
E-mail: pfli@cau.edu.cn
引用本文:
Yuan FAN, PinFang LI, ZhenAn HOU, TuSheng REN, ChunLian XIONG, Biao ZHANG. Water adaptive traits of deep-rooted C3 halophyte (Karelinia caspica (Pall.) Less.) and shallow-rooted C4 halophyte (Atriplex tatarica L.) in an arid region, Northwest China[J]. 干旱区科学, 2012, 4(4): 469-478.
Yuan FAN, PinFang LI, ZhenAn HOU, TuSheng REN, ChunLian XIONG, Biao ZHANG. Water adaptive traits of deep-rooted C3 halophyte (Karelinia caspica (Pall.) Less.) and shallow-rooted C4 halophyte (Atriplex tatarica L.) in an arid region, Northwest China. Journal of Arid Land, 2012, 4(4): 469-478.
Belkheiri O, Mulas M. 2011. The effects of salt stress on growth, water relations and ion accumulation in two halophyte Atriplex species. Environmental and Experimental Botany, doi:10.1016/j.enve¬xpbot.2011.07.001.Biran I, Bravdo B, Bushkinharav I, et al. 1981. Water consumption and growth rate of 11 turfgrasses as affected by mowing height, irriga-tion frequency and soil moisture. Agronomy Journal, 73: 85–90.Bot A, Nachtergaele F, Young A. 2000. Land resource potential and constraints at regional and country levels. World’s Soil Resources Report No. 90. Rome: FAO, 126. Boyer J. 1976. Photosynthesis at low water potentials. Philosophical Transactions of the Royal Society of London: Biological Sciences, 273: 501–512.Brown K, Jordan W, Thomas J. 1976. Water stress induced alterations of the stomatal response to decreases in leaf water potential. Physiologia Plantarum, 37: 1–5.Campbell G S. 1985. Soil physics with BASIC: transport models for soil-plant systems. Developments in Soil Science, No. 14. New York: Elsevier.Chen H, Jiang J G. 2010. Osmotic adjustment and plant adaptation to environmental changes related to drought and salinity. Environmental Reviews, 18: 309–319.Cody M L. 1986. Structural niches in plant communities. In: Diamond J, Case T J. Community Ecology. New York: Harper and Row, 381–405.Cui Y L, Shao J L. 2005. The role of ground water in arid/semiarid ecosystems, Northwest China. Ground Water, 43: 471–477.Dong X J, Yang B Z, Guo K, et al. 1994. An investigation on the water physio-ecological characteristics of some psammophytes. Acta Phytoecologica Sinica, 18: 86–94.Farquhar G D, Sharkey T D. 1982. Stomatal conductance and photosynthesis. Annual Review of Plant Physiology, 33: 317–345.Ghannoum O. 2009. C4 photosynthesis and water stress. Annals of Botany, 103: 635–644.Hernández E I, Vilagrosa A, Pausas J G, et al. 2010. Morphological traits and water use strategies in seedlings of Mediterranean coexisting species. Plant Ecology, 207: 233–244.Hsiao T C. 1973. Plant responses to water stress. Annual Review of Plant Physiology, 24: 519–570.Jarvis P. 1976. The interpretation of the variations in leaf water potential and stomatal conductance found in canopies in the field. Philosophical Transactions of the Royal Society of London: Biological Sciences, 273: 593–610.Jongdee B, Fukai S, Cooper M. 2002. Leaf water potential and osmotic adjustment as physiological traits to improve drought tolerance in rice. Field Crops Research, 76: 153–163.Kalapos T, van den Boogaard R, Lambers H. 1996. Effect of soil drying on growth, biomass allocation and leaf gas exchange of two annual grass species. Plant and Soil, 185: 137–149.Leffler A J, Ivans C Y, Ryel R J, et al. 2004. Gas exchange and growth responses of the desert shrubs Artemisia tridentata and Chryso¬thamnus nauseosus to shallow-vs. deep-soil water in a glasshouse experiment. Environmental and Experimental Botany, 51: 9–19.Levitt J. 1980. Responses of Plants to Environmental Stress. I. Chilling, Freezing, and High Temperature Stresses, 2nd ed. New York: Academic Press, 454.Li Y Y, Pang H C, Zhang H L, et al. 2008. Effect of irrigation management on soil salinization in Manas River Valley, Xinjiang, China. Frontiers of Agriculture in China, 2: 216–223.Mishio M, Yokoi Y. 1991. A model for estimation of water flow resistance in soil-leaf pathway under dynamic conditions. Journal of Experimental Botany, 42: 541–546.Neves J, Ferreira L, Vaz M, et al. 2008. Gas exchange in the salt marsh species Atriplex portulacoides L. and Limoniastrum monopetalum L. in Southern Portugal. Acta Physiologiae Plantarum, 30: 91–97.Noy-Meir I. 1973. Desert ecosystems: environment and producers. Annual Review of Ecology and Systematics, 4: 25–51.O'Toole J C, Cruz R T. 1980. Response of leaf water potential, stomatal resistance, and leaf rolling to water stress. Plant Physiology, 65: 428–432.Pro W. 2004. WinRHIZO Pro 2004a Software: Root Analysis. Regent Instruments Inc., Quebec, Canada.Sanchez-Diaz M F, Kramer P J. 1971. Behavior of corn and sorghum under water stress and during recovery. Plant Physiology, 48: 613–616.Schwinning S, Ehleringer J R. 2001. Water use trade-offs and optimal adaptations to pulse-driven arid ecosystems. Journal of Ecology, 89: 464–480.Taylor H, Hulme S, Rees M, et al. 2010. Ecophysiological traits in C3 and C4 grasses: a phylogenetically controlled screening experiment. New Phytologist, 185: 780–791.Taylor S, Ripley B, Woodwardi F, et al. 2011. Drought limitation of photosynthesis differs between C3 and C4 grass species in a comparative experiment. Plant, Cell and Environment, 34: 65–75.Vertovec M, Sakçali S, Ozturk M, et al. 2001. Diagnosing plant water status as a tool for quantifying water stress on a regional basis in Mediterranean drylands. Annals of Forest Science, 58: 113–125.Wang R. 2007. C4 plants in the deserts of China: occurrence of C4 photosynthesis and its morphological functional types. Photosynthetica, 45: 167–171.Wu D X, Wang G X, Bai Y F, et al. 2004. Effects of elevated CO2 concentration on growth, water use, yield and grain quality of wheat under two soil water levels. Agriculture, Ecosystems and Environment, 104: 493–507.Xu H, Li Y. 2006. Water-use strategy of three central Asian desert shrubs and their responses to rain pulse events. Plant and Soil, 285: 5–17.Yu G R, Zhuang J, Nakayama K, et al. 2007. Root water uptake and profile soil water as affected by vertical root distribution. Plant Ecology, 189: 15–30.Zeng F, Bleby T M, Landman P A, et al. 2006. Water and nutrient dynamics in surface roots and soils are not modified by short-term flooding of phreatophytic plants in a hyperarid desert. Plant and Soil, 279: 129–139.