The role of hormones in regulating the germination of polymorphic seeds and early seedling growth of Atriplex triangularis under saline conditions

Khan, M. Ajmal; Ungar, Irwin A.

doi:10.1111/j.1399-3054.1985.tb02827.x

Cited by 56 publications

(31 citation statements)

References 20 publications

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“…(1999) A adição do GA 3 causou estímulo significativo à germinabilidade das sementes sob estresse salino nos potenciais -0,8MPa, em que na ausência desse fitoregulador, não ocorreu a germinação, indicando, dessa forma, sua eficácia na atenuação do estresse hídrico induzido pelas soluções de PEG, conduzindo assim a uma ampliação do limite máximo de tolerância ao estresse hídrico. Porém, nos demais potenciais, a resposta foi estatisticamente igual ao das soluções salinas sem--fitoregulador, indicando que, provavelmente, os processos metabólicos essenciais das sementes Ciência Florestal, v.11, n.1, 2001 podem ter sido intensamente afetados, impedindo a germinação dessas sementes (KHAN & UNGAR, 1985 …”

Section: Atenuação Do Estresse Hídrico E Salino Com Adição De Giberelinaunclassified

Efeitos dos estresses hidrico e salino e da ação de giberelina em sementes de Senna spectabilis.

Jeller

Perez²

2001

Ciênc. Florest.

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RESUMOSenna spectabilis (DC.) Irwin et Barn. variedade excelsa (Schrad.) Irwin et Barn. é uma leguminosa de porte arbóreo indicada para paisagismo, arborização urbana e plantios em áreas degradadas recomendadas para preservação permanente. Na arborização ou em áreas degradadas essas plantas ficam sujeitas ao estresse hídrico e/ou salino. Assim foram estudados aspectos relativos aos efeitos desses estresses simulados e a ação de fitorregulador em sementes sob tais estresses. As sementes foram colocadas em placas de Petri sobre papel de filtro umedecido com Captan (2%) ou solução-teste e incubadas sob 27ºC. As soluções-teste foram PEG 6000 a 0,0; -0,2; -0,4; -0,6; -0,7 e -0,8MPa e NaCl a 0,0; -0,2; -0,4; -0,6; -0,8; -1,0; -1,2; -1,4; -1,5; -1,6 e -1,7MPa com ou sem a adição de GA 3. As sementes de Senna spectabilis sob estresse hídrico induzido com PEG 6000 apresentaram limite máximo de germinabilidade a -0,7MPa, não sendo considerado um limite elevado de tolerância, em comparação com outras espécies lenhosas. Com relação ao efeito do estresse salino, a diminuição do potencial osmótico das soluções de NaCl levou a um decréscimo no sincronismo, na velocidade e germinabilidade, com germinação totalmente suprimida a -1,6MPa. A adição de 40ppm de ácido giberélico atenuou parcialmente os efeitos dos estresses hídrico e salino. Palavras-chave:Cassia excelsa, Senna spectabilis, germinação, estresse, giberelina. ABSTRACTSenna spectabilis (DC.) Irwin et Barn. variedade excelsa (Schrad.) Irwin et Barn. is a leguminosae woody species of low frequency in cerrado and caatinga of the Brazilian northeast. It is used in landscaping designs due to it's natural beauty, streets arborization and in reflorestation of degraded areas. The aim of this work was to extend the knowledge about the biology of this species and to study the effects of water and salt stress and gibberellins on seed germination. Four replications of 50 seeds were used for each treatment and germination was carried out in 9cm Petri lived with filter paper moistened with test-solution. Senna espectabilis seeds did not present a wide tolerance to water stress and the germination was supressed at -0,7MPa. The reduction of NaCl

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Section: Atenuação Do Estresse Hídrico E Salino Com Adição De Giberelinaunclassified

Efeitos dos estresses hidrico e salino e da ação de giberelina em sementes de Senna spectabilis.

Jeller

Perez²

2001

Ciênc. Florest.

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“…Timson index of germination velocity: germination velocity = ∑G/t, where G is the percentage of seed germination at 24 h intervals and t is the total germination period (Khan and Ungar, 1985).…”

Section: Bacterial Inoculation Effects On Maize and Sorghumsudangrassmentioning

confidence: 99%

Effect of Brevibacterium iodinum RS16 and Methylobacterium oryzae CBMB20 Inoculation on Seed Germination and Early Growth of Maize and Sorghum-sudangrass hybrid Seedling under Different Salinity Levels

Kim¹,

Hwang²,

Saravanan³

et al. 2012

Korean Journal of Soil Science and Fertilizer

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Salinity is one of the most relevant abiotic factor limiting crop yield and its net primary productivity. In addition, salinity induces an increased stress ethylene synthesis in plants which, in turn, exacerbate the responses to the stressor. Bacterial single or co-inoculation effect was tested using previously characterized plant growth promoting (PGP) bacteria Brevibacterium iodinum RS16 and Methylobacterium oryzae CBMB20 on maize and sorghum-sudan grass hybrid under different concentrations of NaCl. Non-inoculated maize and sorghum-sudangrass hybrid showed 33.4% and 20.0% reduction in seed germination under highest NaCl (150 mM) level tested. However, under the same NaCl concentration, co-inoculation with B. iodinum RS16 and M. oryzae CBMB20 PGP strains increased the seed germination in maize (16.7%) and sorghumsudangrass hybrid (4.4%). In Gnotobiotic growth pouch experiments conducted for maize and sorghumsudangrass hybrid, co-inoculation of PGP B. iodinum RS16 and M. oryzae CBMB20 mitigated the salinity stress and promoted root length by 22.9% and 29.7%, respectively. Thus the results of this study could help in development of potential bioinoculants that may be suitable for crop production under saline conditions.

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“…The rate of germination was estimated using a modified Timson index of germination velocity = RG/t, where G is the percentage of seed germination at 2 days intervals and t is the total germination period (Khan and Ungar, 1985). The maximum value possible using this index with these experiments was 1000/20 = 50.…”

Section: Methodsmentioning

confidence: 99%

Effects of Dormancy Regulating Chemicals on Innate and Salinity Induced Dormancy in the Invasive Prosopis juliflora (Sw.) DC. Shrub

2005

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The effect of different types and concentrations of dormancy regulating chemicals (DRCs) on innate and induced dormancy was evaluated under optimal germination conditions in the invasive Prosopis juliflora shrub. Lower concentrations of gibberellic acid (0.3 mM) and kinetin (0.05 mM) were more effective in enhancing germination % and rate at higher concentrations of NaCl, but the reverse was true for thiourea. None of the DRCs alleviated innate dormancy of P. juliflora. Germination % and rate decreased as salinity increased. Percent final germination of non-treated seeds was significantly reduced at 500 mM NaCl and virtually inhibited in 600 mM NaCl. Germination reduction in 500 mM NaCl was not alleviated by any of the DRCs, but inhibition induced at 600 mM NaCl was partially alleviated by all the DRCs. Gibberellic acid had a significantly greater effect than kinetin in alleviating germination inhibition. For restoration of saline soil through the use of P. juliflora, results suggest using DRCs, particularly gibberellic acid and thiourea, as a preseeding treatment can overcome the problem of reduced germination.

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The role of hormones in regulating the germination of polymorphic seeds and early seedling growth of Atriplex triangularis under saline conditions

Cited by 56 publications

References 20 publications

Efeitos dos estresses hidrico e salino e da ação de giberelina em sementes de <i>Senna spectabilis. </i>

Efeitos dos estresses hidrico e salino e da ação de giberelina em sementes de <i>Senna spectabilis. </i>

Effect of Brevibacterium iodinum RS16 and Methylobacterium oryzae CBMB20 Inoculation on Seed Germination and Early Growth of Maize and Sorghum-sudangrass hybrid Seedling under Different Salinity Levels

Effects of Dormancy Regulating Chemicals on Innate and Salinity Induced Dormancy in the Invasive Prosopis juliflora (Sw.) DC. Shrub

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