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Article Dans Une Revue New Phytologist Année : 2001

Nitrogen-limited growth of lettuce is associated with lower stomatal conductance

Résumé

C assimilation (A) has been shown to limit the growth of young Lactuca sativa (lettuce) plants following an interruption in their external N supply. Further data from these plants were used to test two hypotheses: that N-limited growth of lettuce is associated with lower stomatal conductance (g(s)); and that reductions in g(s) result from adjustments to stomatal frequency or distribution. The photosynthetic characteristics, nitrate and organic N-concentrations, as well as epidermal and stomatal distributions, were determined in leaves of hydroponically grown lettuce plants supplied continuously with N or with N removed for up to 14 d. Although N-limited plants had lower maximum rates of A, comparisons at equivalent values of g(s) showed that A was not directly limited by organic-N but by g(s) Reductions in g(s) under N-limiting conditions did not associate with adjustments to stomatal frequency or distribution. Associations between plant N and A could arise either through stomata responding directly to signals induced by N deprivation or to increased CO2 partial pressure at the sites of carboxylation.
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Dates et versions

hal-02675478 , version 1 (31-05-2020)

Identifiants

  • HAL Id : hal-02675478 , version 1
  • PRODINRA : 202626
  • WOS : 000171375300011

Citer

Martin R. Broadley, Abraham A. Escobar Gutierrez, Amanda Burns, Ian G. Burns. Nitrogen-limited growth of lettuce is associated with lower stomatal conductance. New Phytologist, 2001, 152 (1), pp.97-106. ⟨hal-02675478⟩

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