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Studies on the variability of stomatal density in soybean cultivars 2. influence of restrictions of soil moisture and light intensity on stomatal density



Studies on the variability of stomatal density in soybean cultivars 2. influence of restrictions of soil moisture and light intensity on stomatal density



Japanese Journal of Crop Science 54(2): 127-133



The influences of soil moisture and light intensity on stomatal density (number of stomata per unit of surface area of epidermis, SD) in soyban cultivars were examined by water stress- and light shading-tests. The influences were also investigated by dividing SD into the 2 components, (1) the power of stomatal differentiation (Ratio of stomatal number of epidermal cell number, PS), and (2) the epidermal cell size (surface area of a epidermal cell, EC). The relationhship among SD, PS and EC is shown in an equation. In experiment A, soil moisture was restricted at a level of 35% of dried soil weight while the soil moisture in the control was always kept 50-60%. In experiment B, light intensity was restricted by shading at a 45% level (Lx) to the control. Each plant was grown in a natural-light phytotron. Observations of stomata were made on the 5th and the 3rd leaflet in the experiment A and B, respectively. In general, the epidermis of adaxial leaf side decreased in SD and that of abaxial leaf side increased in SD with the restriction of soil moisture. The reverse change regarding SD between the adaxial and abaxial leaf sides was observed. Dividing SD into the components, the adaxial PS sharply decreased with the restriction of soil moisture, and this caused the decreasing effect on adaxial SD. While, the abaxial PS was kept almost constant. Generally, EC decreased with the restriction and this caused the increasing effect on adaxial and abaxial SD, especially in 2 cultivars, Tokachi Hadaka and Ichigoo Wase. In the adaxial leaf side SD decreased with the restriction. The epidermis of both leaf sides decreased in PS and increased in EC with the restriction of light intensity. These changes of the 2 components caused the decreasing effect on adaxial and abaxial SD. Some cultivars showed the special response to water stress or light shading, and PS or EC of these cultivars changed remarkably under the condition of the restriction. Varietal differences of SD, PS and EC were disturbed by these environmental conditions.

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Accession: 006522918

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