• P Pardha Saradhi

      Articles written in Proceedings – Plant Sciences

    • Correlated promotion of ray-floret growth in chrysanthemum by potassium chloride, gibberellic acid and sucrose

      P Pardha Saradhi H Y Mohan Ram

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      The role of 10−2 M, 2×10−2 M, 4×10−2 M potassium chloride, gibberellic acid (10−5 M; GA3) and sucrose (5×10−2 M) (used individually and in various combinations) in the elongation growth of excised ray-florets ofChrysanthemum morifolium var. Jyothsna, was investigated. KCl (10−3 M) caused 33·3% increase in elongation as compared to control (16·7%). With GA3 and sucrose the percentage of elongation recorded was 39·8 and 28·9 respectively. Maximal growth response (82·8%) was recorded in KCl (4×10−2 M)+GA3 (10−5 M)+sucrose (5×10−2 M). When used in combination either with GA3 or sucrose, KCl showed an almost additive effect, whereas in the presence of both it acted synergistically. It is inferred that the increased turgor resulting from sucrose-promoted potassium uptake along with GA3-caused tissue extensibility accounts for enhanced floret growth.

    • Correlated changes in carbohydrate levels and associated enzyme activities during development and senescence of ray florets inChrysanthemum

      P Pardha Saradhi H Y Mohan Ram

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      Changes in fresh and dry weight, content of sugars and starch and activities of α-amylase and acid invertase were determined during various stages of ray floret development and senescence inChrysanthemum. Total and reducing sugars increased until the ray florets attained their maximal expansion, peak fresh and dry weights. This coincided with the highest activity of invertase. Starch content and maximal activity of α-amylase declined much earlier. It is presumed that invertase rather than α-amylase plays a major role in the expansion of ray florets inChrysanthemum. Senescing stages of ray floret are characterized by decrease in fresh and dry weights and loss of metabolites and a marked decline in the activities of both invertase and α-amylase.

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