Short Communications/Kort Mededelings

Changes in percentage moisture loss of excised leaves of seven field-grown grain sorghum genotypes

Published in: South African Journal of Plant and Soil
Volume 5, issue 1, 1988 , pages: 48–50
DOI: 10.1080/02571862.1988.10634251
Author(s): W.G. Wenzel, Republic of South Africa, W.J. van den Berg, Republic of South Africa

Abstract

The objectives of these experiments were to study the seasonal and diurnal changes in percentage moisture loss (PML) and correlated characteristics of excised leaves. Seven grain sorghum genotypes were planted in a randomized block design and their PML and the initial moisture content (IMC) were evaluated. The PML values obtained for each of the seven genotypes were nearly identical to those obtained in a similar experiment of the previous season. A certain severity of moisture stress was required to obtain these results. The PML of seedlings of drought-tolerant genotypes was less than those of susceptible genotypes. These genotypic differences were reversed before the onset of flowering. Probable causes for these observations are discussed. The PML is considered a valuable tool for screening grain sorghum genotypes for drought resistance at both the seedling stage of greenhouse-grown plants and at later growth stages of field-grown plants.

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