Scanning electron microscopic investiganons on theı leaf micro-morphological and mesophyll parameters inı association with photosynthetic activity of threeı mulberry (Morus spp.) genotypes

Vineet, K. and Kodandaramaiah, J. and Jhansi Lakshmi, K. and Mala V., Rajan and Kamble, C. K. (2009) Scanning electron microscopic investiganons on theı leaf micro-morphological and mesophyll parameters inı association with photosynthetic activity of threeı mulberry (Morus spp.) genotypes. Journal of Tropical Plant Physiology, 3. pp. 37-49.

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Abstract

A scanning electron microscopic study on the micro-morphological and mesophyII parameters of three mulberry genotypes having different yield potentials viz. Punjab local, S-30 and China Peking was under taken to find out their association with photosynthetic rate. The results of the present study revealed that the leaf thickness of Punjab local was found maximum (l27.42±O.582 µm) and conversely minimum in S-30 genotype (119.17±O.752 µm). Statistically significant differences were found among three genotypes for leaf thickness character against all the other parameters like thickness of palisade and spongy tissues, percentage of palisade parenchyma in mesophyII and the rate of photosynthesis. With regard to the total density of idioblasts per mm2 leaf surface area, it was observed that sufficient variability exist among the genotypes. The experimental data also indicated the highest photosynthetic rate in S-30 genotype (21.56±O.357 µmol m-² S-¹) with contrastingly low in China Peking (11.06±0.529 µmol m-2 S-¹) significantly associating with the respective micro-morphological and mesophyll characteristics. Hence, these structural traits which are found correlated with higher physiological efficiency can be conveniently utilized in the screening and evaluation of mulberry genotypes for further improvement in leaf yield and biomass production by the plant breeding programmes.

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