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Journal of Experimental Botany, Vol. 53, No. 368, pp. 473-481, March 1, 2002
© 2002 Oxford University Press

Original Papers

Leaf initiation and development in soybean under phosphorus stress

Joseph Chiera1, Judith Thomas1 and Thomas Rufty2,3

1 Department of Botany, North Carolina State University, Raleigh, NC 27695-7612, USA
2 Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620, USA

Experiments investigated changes in leaf development in young soybean plants progressing into P stress. The apical meristem and leaf structure were examined anatomically to evaluate the involvement of cell division and cell expansion in the restriction of leaf number and individual leaf size. Seedlings were deprived of P for 32 d following germination. Leaf initiation rates declined noticeably after about 2 weeks, even though the apical dome was of similar size and had a similar number of cells as controls. Primordia appeared morphologically similar also. Expansion of primary and the first three trifoliolate leaves of -P plants was severely reduced, and expansion of each leaf ceased, uniformly, when an area of about 40 cm2 was obtained. Leaf epidermal cell size in the lateral plane was unaffected. The results indicate that expansion of leaves under P stress was limited by the number of cell divisions, which would imply control of cell division by a common regulatory factor within the leaf canopy.

Key words: Cell division, cell expansion, growth, leaf development, phosphorus, shoot apex.


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