Abnormal Stomatal Behavior in Wilty Mutants of Tomato 1
AUTOR(ES)
Tal, Moshe
RESUMO
An attempt was made to explain the excessive wilting tendency of 3 tomato mutants, notabilis, flacca, and sitiens. The control varieties in which these mutations were induced are Rheinlands Ruhm for flacca and sitiens and Lukullus for notabilis. Although all 3 mutants are alleles of separated loci, they seem to react similarly to water stress. The mutants wilt faster than the control plants when both are subjected to the same water stress. It was demonstrated by measurements of water loss from whole plants that all 3 mutants have much higher rates of transpiration than the control varieties, particularly at night. The extent of cuticular transpiration was compared in both kinds of plants by measuring the rate of water loss from detached drying leaves coated with vaseline on the lower surface. The difference in cuticular transpiration between the mutant and the control plants seems to be negligible. However, various facts point to stomata as the main factor responsible for the higher rates of water loss in the mutant plants. The stomata of the latter tend to open wider and to resist closure in darkness, in wilted leaves, and when treated with phenylmercuric acetate. Stomata of the 2 extreme mutants, sitiens and flacca, remain open even when the guard cells are plasmolyzed. The stomata of the mutants also are more frequent per unit of leaf surface and vary more in their size.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=550536Documentos Relacionados
- Abnormal Stomatal Behavior and Hormonal Imbalance in flacca, a Wilty Mutant of Tomato: I. Root Effect and Kinetin-like Activity
- Abnormal Stomatal Behavior and Hormonal Imbalance in flacca, a Wilty Mutant of Tomato: II. Auxin- and Abscisic Acid-like Activity
- Abnormal Stomatal Behavior and Hormonal Imbalance in Flacca, a Wilty Mutant of Tomato: III. Hormonal Effects on the Water Status in the Plant 1
- Abnormal Stomatal Behavior and Hormonal Imbalance in flacca, a Wilty Mutant of Tomato: V. Effect of Abscisic Acid on Indoleacetic Acid Metabolism and Ethylene Evolution
- Abnormal Stomatal Behavior and Hormonal Imbalance in flacca, a Wilty Mutant of Tomato: IV. Effect of Abscisic Acid and Water Content on RNase Activity and RNA