Action of Gibberellic Acid on Cell Proliferation in the Subapical Shoot Meristem of Watermelon Seedlings

Liu, Peter B. W.; Loy, J. Brent

doi:10.2307/2441833

Cited by 15 publications

(7 citation statements)

References 13 publications

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“…The distinctive ability of GA among recognized plant hormones to promote extensive growth of intact plants of many species reported by Salisbury and Ross (1992). Liu and Loy (1976) observed that GA promote cell division by stimulating cells in the G 1 phase to enter the S phase and by shortening the duration of S phase. They concluded that increased cell number leads to more rapid stem growth as each of the cells can Harvest I, II, III and IV were done 2, 4, 6, and 8 weeks after treatment application, respectively.…”

Section: Discussionmentioning

confidence: 99%

Growth and biomass production in potato grown in the hot tropics as influenced by paclobutrazol

Tekalign¹,

Hammes²

2005

Plant Growth Regul

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Two similar field trials were carried out during 2003 in a hot tropical region of eastern Ethiopia to investigate the effect of leaf and soil applied paclobutrazol on the growth, dry matter production and assimilate partitioning in potato. A month after planting paclobutrazol was applied as a foliar spray or soil drench at rates of 0, 2, 3, and 4 kg a.i. paclobutrazol ha À1 . Plants were sampled during treatment application and subsequently 2, 4, 6 and 8 weeks after treatment application. The data was analyzed using standard growth analyses techniques. None of the growth parameters studied was affected by the method of paclobutrazol application. Paclobutrazol decreased leaf area index, crop growth rate, and total biomass production, and increased specific leaf weight, tuber growth rate, net assimilation rate, and partitioning coefficient of potato. At all harvesting stages, paclobutrazol reduced the partitioning of assimilate to the leaves, stems, and roots and stolons and increased allocation to the tubers. Although paclobutrazol decreased the total biomass production it improved tuber yield by partitioning more assimilates to the tubers. Paclobutrazol improved the productivity of potato under tropical conditions by redirecting assimilate allocation to the tubers.

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Section: Discussionmentioning

confidence: 99%

Growth and biomass production in potato grown in the hot tropics as influenced by paclobutrazol

Tekalign¹,

Hammes²

2005

Plant Growth Regul

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“…GA enhances internode elongation of intact stems (Salisbury and Ross, 1992). Liu and Loy (1976) showed that GA promote cell division by stimulating cells in the G 1 phase to enter the S phase and by shortening the duration of S phase. They concluded that increased cell numbers lead to more rapid stem growth.…”

Section: Discussionmentioning

confidence: 99%

Paclobutrazol-induced Leaf, Stem, and Root Anatomical Modifications in Potato

Tsegaw¹,

Hammes²,

Robbertse³

2005

HortSci

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Potato (Solanum tuberosum L.) treatment with paclobutrazol resulted in short and compact plants having dark green and thicker leaves, and wider stem and root diameters. Investigating the underlying anatomical modifications in response to the treatment was the objective of the study. Plants of potato cultivar BP 1 were treated with 0, 45.0, 67.5, and 90.0 mg paclobutrazol per plant as a foliar spray. A month after treatment leaf, stem and root materials were taken from the control and plants treated with 67.5 mg paclobutrazol, and histological observations were made using light microscope. Leaves of treated plants showed an increased chlorophyll a and b contents, thicker epicuticular wax layer, elongated and thicker epidermal, palisade and spongy mesophyll cells. paclobutrazol increased stem diameter by about 58% due to induction of thicker cortex, larger vascular bundles, and wider pith diameter associated with larger pith cells. Widening the cortex and the induction of more secondary xylem vessels in response to paclobutrazol treatment increased the root diameter by about 52%. Paclobutrazol treatment remarkably increased the accumulation of starch granules in the stem pith cells and cortical cells of the stem and root. This study is similar to the other relevant studies in reporting an increased leaf thickness, and stem and root diameters; however, most of the underlying anatomical modifications described above have not been reported previously.

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“…Thus, applied GA3 acted on shoot apical eells through their progression from Gj to S whether the transition to flowering was obtained or not (Besnard-Wibaut et al 1983). Likewise, applied GA3 acted mainly through the shortetring of the Gj phase when it was effective in inducing flowering in Rudbeckia (Jacqmard 1968) or in promoting stibapical elotigation in watermelon (Liu and Loy 1976).…”

Section: Discussionmentioning

confidence: 99%

Photoperiod and gibberellic acid – control of the cell cycle in the meristem of Silene armeria and its effects on flowering

Besnard-Wibaut

Cochet

Noin

1989

Physiologia Plantarum

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Besnard -Wibaut, C, Cochet, T. and Noin, M. 1989. Photoperiod and gihberellic acid -control of the cell cycle in the meristem of Silene armeria and its effects on flowering. Plants of Silene armeria L., strain S,.], a quantitative long-day (LD) species which is known to react tO' GA3 by flowering after attaining the 'intermediate stage', were induced by two LD or by two GA3 applications. Changes in the mitotic index and DNA content (microdensitometric estimation) of cells in the axial zone, lateral zone and rib meristem of the shoot apex were observed during the first 48 h of each treatment. Similar mitotic activation occurred in response to LD or GAj after a 6-8 h lag period. This was preceded by a decrease in the proportion of nuclei with a 2C DNA content, indicating that in this species the control point for the shortening of the cell cycle was essentially in Gj. A second mitotic peak was observed 16 h later in photoinduced meristems, resulting in more pronounced cellular synchronization. These further events were not seen in GAj-treated plants where only the meristematic activity was slightly, but reproducihiy higher than in the control. Thus, two successive synchronizations of cell division are a typical feature of LD induction. The data are discussed with regard to the competence of shoot apical cells to be reactivated. The essential changes for tfie transition to flowering depend on these differential pattems of cell reactivation.

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Action of Gibberellic Acid on Cell Proliferation in the Subapical Shoot Meristem of Watermelon Seedlings

Cited by 15 publications

References 13 publications

Growth and biomass production in potato grown in the hot tropics as influenced by paclobutrazol

Growth and biomass production in potato grown in the hot tropics as influenced by paclobutrazol

Paclobutrazol-induced Leaf, Stem, and Root Anatomical Modifications in Potato

Photoperiod and gibberellic acid – control of the cell cycle in the meristem of Silene armeria and its effects on flowering

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