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. 1983 May;72(1):245–250. doi: 10.1104/pp.72.1.245

Gas Exchange, Stomatal Behavior, and δ13C Values of the flacca Tomato Mutant in Relation to Abscisic Acid 1

Kent J Bradford 1,2, Thomas D Sharkey 1,3, Graham D Farquhar 1
PMCID: PMC1066203  PMID: 16662969

Abstract

The relationship between stomatal conductance and capacity for assimilation was investigated in flacca, a mutant of tomato (Lycopersicon esculentum Mill.) that has abnormal stomatal behavior and low abscisic acid (ABA) content. The assimilation capacity, determined by measuring assimilation rate as a function of intercellular CO2 pressure, did not differ in leaves of flacca and its parent variety, Rheinlands Ruhm (RR). On the other hand, stomatal conductance of flacca leaves was greater than that of RR, and could be phenotypically reverted by spraying with 30 micromolar ABA. Stomatal conductance of flacca leaves was also reduced by increasing CO2 pressure, increasing leaf to air vapor pressure difference, and decreasing quantum flux, irrespective of ABA treatment.

The high conductance of flacca leaves resulted in a high intercellular CO2 pressure. This allowed greater discrimination against 13CO2, as evidenced by more negative δ 13C values for flacca as compared to RR. The δ 13C values of both flacca and RR plants as influenced by ABA treatment were consistent with predictions based on gas exchange measurements, using a recent model of discrimination.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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