Stomatal density of 'Kachamita' and 'carabao' mango leaves and diurnal pattern of guard cell movement in water stressed and unstressed plants

Date

10-1979

Degree

Bachelor of Science in Agriculture

Major Course

Major in Horticulture

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Ernie V. Baclig

Abstract

Stomata and stomatal density on the upper and lower surfaces of young and mature leaves of the kachamitha and Carabao cultivars of mango were examined on imprints made by the silicone rubber-cellulose acetate method. The ranunculaceous stomata, which is typical to the species, tended to he clustered near the secondary veins. In both cultivars, stomata occured on the upper and lower leaf surfaces with much higher densities on the lower surfaces, the differences statistically significant at the 1% level.

The diurnal patterns of leaf stomatal resistance of water-stressed and unstressed 'Kachamitha' and 'Carabao" were measured using a portable ventillated diffusion poromoter. Resistance values obtained on unstressed plants both cultivars followed the expected diurnal cycle of low fat at daytime and high at night. This diurnal pattern was absent on stressed plants which had generally higher stomatal resistance than unstressed. Stomata of stressed plants were effectively closed during the daylight hours.

Mean temperatures of the leaves assumed the diurnal pattern of the ambient air temperature. Leaf temperature differences between water-stressed and unstressed plants were small and not statistically significant.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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