H Y Mohan Ram
Articles written in Proceedings – Plant Sciences
Volume 87 Issue 5 May 1978 pp 125-127
Clearing can be successfully attained by soaking portions of leaves in a mixture of trichloroacetic acid and phenol (2:1) for 10–15 min at 60° C. These can be stained with writing ink (Chelpark make). The intensity of staining does not change even in permanent preparations. The preparations made as outlined above have been found specially beneficial for studying the morphology of fungi parasitic on leaves.
Volume 87 Issue 11 November 1978 pp 255-270
Thirty days after application, GA3 promoted growth and augmented the number of secondary axillary branches. Curiously at 100 ppm GA3 markedly inhibited the length of the secondary axillary branches of PAB3 to PAB6.
These studies show that a complex mechanism of apical dominance operates in
Volume 88 Issue 4 July 1979 pp 303-308
Apical application of cobalt chloride to female plants (50 or 100 μg/ plant) of
Volume 89 Issue 5 October 1980 pp 323-330
Separation of the outer bract enclosing the flower bud and spike axis results in the stimulation of amylase synthesis in the petals of gladiolus. Light is implicated in this process. Amylase production is localised in the petal epidermis (which is free of starch) and not generalised in the ground parenchyma (which contains abundant starch). Depletion of starch in the petal is strictly basipetal. It is proposed that the reducing sugars released from hydrolysis of starch in the ground parenchyma cause osmotic water intake, leading to petal expansion and flower opening.
Volume 91 Issue 2 April 1982 pp 101-106
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 of
Volume 91 Issue 5 October 1982 pp 371-378
The percentage of buds opening and flower longevity as affected by the availability of water and sucrose to out spikes of gladiolus were studied. Uptake of sucrose solution and fresh weight changes in spikes were dependent on sucrose concentration. Marked reduction in uptake and fresh weight occurred when polyethylene glycol (
Volume 93 Issue 3 July 1984 pp 253-274
Flower growth and opening are commonplace events, but physiologically intricate and inadequately explained. In this review, we have brought together and evaluated information on this subject to focus attention on the dynamic facets of flower development. In particular, the physiological basis of flower bud dormancy, nature of cleistogamy, mechanism of flower bud growth and turgor maintenance and role of stamens in corolla growth have been examined. The regulation of flower movements and opening by temperature and light, and circadian rhythms in flower opening have been discussed, along with a consideration of the role of the petal epidermis in light perception.
It is emphasized that studies on flower physiology need to be intensified in view of the lacunae in our basic knowledge as well as to provide a sound basis for improving yields of both agricultural and horticultural crops.
Volume 94 Issue 2-3 April 1985 pp 525-537
Flower initiation is an important morphogenetic event. In this brief review the formative, ultrastructural, cytological and biochemical changes that occur in the transitional meristems in a few selected species have been discussed. In the evoked meristems, the number of plastids, mitochondria and ribosomes are usually higher. Further, an early shift of 4C nuclei to the 2C value, an increase in respiration and enhanced activities of dehydrogenase and phosphatase have been observed. The molecular events that ensue immediately after induction need further study.
The factors that regulate flower morphogenesis in vitro and reversal of excised flower buds to vegetative growth have been discussed. Reports on the modification of inflorescence development through the application of growth regulators have been analysed.
Volume 97 Issue 5 October 1987 pp 377-384
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 in