African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12193

Full Length Research Paper

Influence of soil drought stress on photosynthesis, carbohydrates and the nitrogen and phophorus absorb in different section of leaves and stem of Fugi/M.9EML, a young apple seedling

Zhang Jie1, Yao Yuncong1*, John G. Streeter2 and David C. Ferree2
1Department of plant science and technology, Beijing University of Agriculture, Beijing, 102206 China. 2Department of Horticulture and Crop Science, Ohio State University and OARDC,1680 Madison Avenue, Wooster, Ohio 44691 USA.
Email: [email protected]

  •  Accepted: 28 July 2010
  •  Published: 31 August 2010

Abstract

Drought is the most significant limiting factor for plant cultivation. Greenhouse-grown 1-year-old potted M.9EMLA apple trees (Malus domestica Borkh.) (after growing for 6 weeks) were subjected to drought stress by withholding water for an additional six-week period. The photosynthesis, carbohydrates and the nitrogen (N), phosphorus (P) absorb in the upper, middle and lower leaves of the seedlings were determined. The results revealed that drought stress obviously decreased the photosynthesis and carbohydrates contents in the leaves at all sections of shoot compared with the control. Sorbitol and glucose concentrations increased over time and was kept at a higher level during the drought stress period whereas sucrose concentration declined. N content in the leaves kept a flat trend and was higher than that of the control while P concentration decreased compared with the control. These results demonstrated that drought stress prevented N and P absorbtion and decreased RWC of apple leaves, which caused the decline of photosynthesis and transpiration. Thus, the direct phenotype was the slowed growth which was specifically expressed in decreased plant height, number of leaves, average leaf area and stem diameter.

 

Key words: Malus domestica Borkh, sorbitol, water deficit, transpiration.

Abbreviation

ET, Evapotranspiration; Pn, photosynthesis; E, transpiration; RWC,relative water content; DPS, data processing system.