M.Sc. Tezi Görüntüleme

      In this study, synergistic effects of foliar applications of some plant growth regulators such as gibberellic acid (GA), benzyl adenin (BA) and indole acetic acid (IAA) and zinc ions on the contents of chlorophyll a, total chlorophyll, total soluble carbohydrate, total soluble protein and peroxidase activity and chlorophyll a/chlorophyll b ratio in the leaves of zinc deficient corn seedlings were investigated.

      There is a decrease in chlorophyll a, chlorophyll b, total chlorophyll and total carotenoid contents in three-day zinc (Zn) and plant growth regulator (PGR) treatments and an increase in five-day treatments as compared to the control (+Zn), while a decrease was determining in pentose, hexose, total carbohydrate and protein content in the leaves of Zn deficient seedlings in both three and five-day treatments. A decrease has been observed in pentose and hexose contents except plant growth regulator treatment before Zn spraying (PGR+Zn). The amount of total soluble carbohydrate increased in plant growth regulator spraying only and PGR+Zn spraying, while a decrease was determining in Zn spraying only and Zn treatment before plant growth regulator spraying (Zn+PGR). It has been found that all treatments have led to an increase in protein contents in leaves.

      As a result, it can be said that plant growth regulator treatment before Zn spraying increased foliar Zn uptake, and this treatment may be much useful for agricultural applications.

      Key words: Foliar uptake, Zinc, Phytohormone, Maize, Chlorophyll, Carbohydrate, Protein, Peroxidase