Journal
SOIL SCIENCE AND PLANT NUTRITION
Volume 60, Issue 6, Pages 832-842Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00380768.2014.949853
Keywords
stress; tolerance; phosphorus; Tibetan wild barley (Hordeum vulgare L. ssp. spontaneum); use efficiency
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Funding
- National Natural Science Foundation of China [31330055, 31171544]
- China Agriculture Research System [CARS-05]
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Low phosphorus (LP) limits crop growth and productivity in the majority of arable lands worldwide. Here, we investigated the changes in physiological and biochemical traits of Tibetan wild barleys (Hordeum vulgare L. ssp. spontaneum) XZ99 (LP tolerant), XZ100 (LP sensitive), and cultivated barley ZD9 (moderately LP tolerant) under two phosphorus (P) levels during vegetative stage. These genotypes showed considerable differences in the change of biomass accumulation, root/shoot dry weight ratio, root morphology, organic acid secretion, carbohydrate metabolism, ATPase (Adenosine triphosphatase) activity, P concentration and accumulation under LP in comparison with CK (control) condition. The higher LP tolerance of XZ99 is associated with more developed roots, enhanced sucrose biosynthesis and hydrolysis of carbohydrate metabolism pathway, higher APase (Acid phosphatase) and ATPase activity, and more secretion of citrate and succinate in roots when plants are exposed to LP stress. The results prove the potential of Tibetan wild barley in developing barley cultivars with high tolerance to LP stress and understanding the mechanisms of LP tolerance in plants.
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