The effect of light and exogenous gibberellic acid on respiration pathways during germination of tomato seeds

Seed germination of wild buckwheat (Polygonum convolvulus L.) and cow cockle (Saponaria vaccaria L.) increased with increasing time of immersion in 6% sodium hypochlorite (NaOCl). Maximum germination was obtained at 6 to 8 h for wild buckwheat and at 2 h for cow cockle. The effect of NaOCl treatment of wild buckwheat seeds mimics the effect of acid scarification. Wild buckwheat germination was not influenced by light and (or) gibberellic acid (GA3). To induce 50% germination (t½) of cow cockle NaOCl treatments of 0.5 and 1 h were required for seeds incubating in the dark and light, respectively. Once the seed coat was made more permeable by NaOCl, both the promoting effect of GA3 and the inhibitory effect of light were increased. When the optimum effect of NaOCl occurred, all the seeds germinated. However, prolonged NaOCl treatment resulted in either poor germination or seed disintegration.The hard coat seems to be the main factor in regulating wild buckwheat seed germination. Cow cockle, however, is regulated by at least two other factors, light and hormones, in addition to seed coat.

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Effect of light, gibberellic acid and abscisic acid on germination of guayule (Parthenium argentatum Gray) seed

Industrial Crops and Products ◽

10.1016/j.indcrop.2010.03.012 ◽

2010 ◽

Vol 32 (2) ◽

pp. 111-117 ◽

Cited By ~ 15

Author(s):

P. Dissanayake ◽

D.L. George ◽

M.L. Gupta

Keyword(s):

Abscisic Acid ◽

Gibberellic Acid ◽

Parthenium Argentatum ◽

Effect Of Light

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Effect of light and gibberellic acid on cell division in the first foliage leaf of durum wheat (Triticum durum Desf.)

Planta ◽

10.1007/bf00403018 ◽

1988 ◽

Vol 173 (2) ◽

pp. 257-262 ◽

Cited By ~ 2

Author(s):

S. Baroncelli ◽

A. Cavallini ◽

B. Lercari ◽

P. G. Cionini ◽

F. D'Amato

Keyword(s):

Cell Division ◽

Gibberellic Acid ◽

Durum Wheat ◽

Triticum Durum ◽

Foliage Leaf ◽

Triticum Durum Desf ◽

Effect Of Light

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The effect of light and heat on 4CH and 200CH potencies of gibberellic acid as a promoter of germination in barley seed (Hordeum vulgare), measured by a germination index

10.51415/10321/2691 ◽

2002 ◽

Author(s):

◽

Hayley Pieterse

Keyword(s):

Hordeum Vulgare ◽

Seed Germination ◽

Gibberellic Acid ◽

Germination Index ◽

Barley Seed ◽

Effect Of Light

The purpose of this investigation was to evaluate the effects of light and heat on homoeopathic dilutions of gibberellic acid (cHGA3) as measured on Hordeum vulgare (barley) seed germination.

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Sorting out theLeMANs: endo-β-mannanase genes and their encoded proteins in tomato

Seed Science Research ◽

10.1017/s0960258507786233 ◽

2007 ◽

Vol 17 (3) ◽

pp. 143-154 ◽

Cited By ~ 12

Author(s):

Xuemei Gong ◽

J. Derek Bewley

Keyword(s):

Amino Acid ◽

Amino Acid Sequence ◽

Gibberellic Acid ◽

Cell Walls ◽

Plant Cell Walls ◽

Tomato Seeds ◽

C Terminus ◽

Inactive Form ◽

Genes Encoding ◽

Hydrolysis Of

AbstractEndo-β-mannanase (EC 3.2.1.78) is involved in the hydrolysis of mannan-type polysaccharides that are present in plant cell walls, especially those of the seed endosperm. The genes encoding the endo-β-mannanases have been studied extensively in tomato (Solanum lycopersicum), and five genes (LeMAN1,LeMAN2,LeMAN3,LeMAN4andLeMAN5) and/or their products have been isolated and characterized.LeMAN1,LeMAN2andLeMAN3are expressed in tomato seeds,LeMAN4in the fruit andLeMAN5in the flower.LeMAN5andLeMAN2are now considered to be the same gene, and the former is re-designated asLeMAN2*. Transcripts ofLeMANs1, 2and3are detected only in the endosperm of tomato seeds, and their synthesis is promoted by gibberellic acid.LeMAN4, in the fruit, occurs asLeMAN4aandLeMAN4igenes that encode an active or inactive form of endo-β-mannanase, respectively.LeMAN1–4 enzymes encoded by these genes share 80% similarity in amino acid sequence. In tomato, the leucine amino acid present near to the C-terminus of the endo-β-mannanase is the most important for achieving full activity of the enzyme.

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Matriconditioning integrated with gibberellic acid to hasten seed germination and improve stand establishment of pepper and tomato

Pesquisa Agropecuária Brasileira ◽

10.1590/s0100-204x1999001000023 ◽

1999 ◽

Vol 34 (10) ◽

pp. 1953-1958 ◽

Cited By ~ 11

Author(s):

Claudinei Andreoli ◽

Anwar A Khan

Keyword(s):

Seed Germination ◽

Gibberellic Acid ◽

Stress Conditions ◽

Combined Effects ◽

Stand Establishment ◽

Germination Time ◽

Solid Carrier ◽

Tomato Seeds ◽

Lycopersicon Lycopersicum ◽

Mechanical Restraints

Emergence and stand establishment of tomato (Lycopersicon lycopersicum (L.) (Karsten ex Farw) and pepper (Capsicum annus L.) seeds are often slow and erratic, particularly under stress conditions. Field emergence trials sometimes have not responded to priming in pepper. This study examined the combined effects of matriconditioning and gibberellin application on the germination and stand establishment of pepper and tomato seeds. Pepper and tomato seeds were conditioned with a solid carrier, Micro Cel E, in the presence of gibberellic acid (GA) for 1, 2 , 3 and 4 days at 15 and 25ºC. The results showed that, in all cases, even under stress conditions, the combination of matriconditioning with GA was effective in improving germination and emergence of pepper and tomato. The germination time was, in average, reduced by 2 to 3 days by primed seeds. Thus, matriconditioning, during which germination is suspended, provides an unique means to rapidly and efficiently digest the endosperm by GA-induced enzymes and reduce the mechanical restraints of endosperm thus providing energy to start and sustain embryo growth.

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