Assessment of Seedling Growth of Deepwater Rice Genotypes under Osmotic Stress Condition

Laboratory experiments were conducted to study the effect of salt solution, and size and ageing of seeds on growth efficiency of rice seedlings. Variation in growth efficiency due to different factors was significant. Seeds of Pokkali, BRRI dhan 29, BRRI dhan 40 and BRRI dhan 41 rice genotypes were used. Growth efficiency and other seedling characteristics decreased as salinity levels increased. Three varieties of rice BR 14, BRRI dhan 28 and BR 1, which are large, medium and small grain variety, respectively, were used to study the effect of seed size on growth efficiency and seedling growth. All the parameters decreased remarkably with decreasing seed size. Seed size influenced the growth efficiency significantly. For accelerated ageing test five varieties of freshly harvested seeds were used. The tested varieties responded differently for growth efficiency. When the ageing treatments were extended to 72 hours the growth efficiency depressed markedly for most of the varieties. Key words: Growth efficiency, Ageing, Rice, Salt solution, Seedling growth, Seed size DOI = 10.3329/bjb.v36i2.1508 Bangladesh J. Bot. 36(2): 171-176, 2007 (December)

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Seed germination, seedling growth and seedling development associated physiochemical changes in Salicornia brachiata (Roxb.) under salinity and osmotic stress

Aquatic Botany ◽

10.1016/j.aquabot.2020.103272 ◽

2020 ◽

Vol 166 ◽

pp. 103272

Author(s):

Preeti T. Jacob ◽

Shahrukh A. Siddiqui ◽

Mangal S. Rathore

Keyword(s):

Seed Germination ◽

Osmotic Stress ◽

Seedling Growth ◽

Seedling Development ◽

Salicornia Brachiata

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Germination Ecology of Milkweedvine (Morrenia odorata)

Weed Science ◽

10.1017/s0043174500059981 ◽

1984 ◽

Vol 32 (6) ◽

pp. 781-785 ◽

Cited By ~ 22

Author(s):

Megh Singh ◽

Nagi Reddy Achhireddy

Keyword(s):

Seed Germination ◽

Osmotic Stress ◽

Root Growth ◽

Seedling Growth ◽

Shoot Growth ◽

Seedling Emergence ◽

Germination Percentage ◽

Planting Depth ◽

Germination Ecology ◽

Optimum Ph

The germination of milkweedvine (Morrenia odorataLindl. ♯3MONOD) seed at 20 or 25 C was unaffected by a 12-h photoperiod. The 12-h photoperiod, however, decreased germination by 50% at 15 C. No germination occurred at 35 C regardless of photoperiod. By alternating 35 C for 12 h with 20 C for 12 h, the germination percentage was 57%. Seedling growth was maximum at alternating temperatures of 30/20 C. Optimum pH for germination and seedling growth was 7 and germination did not occur at pH levels below 6. Seed germination declined steadily at osmotic stress below −0.12 MPa; no germination occurred at −0.5 MPa. Seedling growth was not influenced by osmotic stress down to −0.18 MPa. Germination percentages of seeds kept under aerated water and nonaerated water were similar, but the seedling growth was greater in aerated water. Seedling emergence was maximum from depths of 0.5 to 2.5 cm, but no seedling emerged from 0 or 10 cm. Planting depth was negatively correlated (r = −0.7) with shoot growth but positively correlated (r = +0.98) to root growth.

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Effect of Biopriming with Enterobacter Strains on Seed Germination and Seedling Growth of Tomato (Solanum lycopersicum L.) Under Osmotic Stress

Proceedings of the National Academy of Sciences India Section B Biological Sciences ◽

10.1007/s40011-014-0333-8 ◽

2014 ◽

Vol 85 (1) ◽

pp. 63-69 ◽

Cited By ~ 8

Author(s):

Ravindra Mohan Bhatt ◽

Govindan Selvakumar ◽

Kaushal Kishore Upreti ◽

Pavithra Chikkakadaluru Boregowda

Keyword(s):

Seed Germination ◽

Osmotic Stress ◽

Solanum Lycopersicum ◽

Seedling Growth ◽

Solanum Lycopersicum L

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EARLY IDENTIFICATION OF SALT TOLERANT GENOTYPES OF RICE (ORYZA SATIVA L.) USING CONTROLLED DETERIORATION

Experimental Agriculture ◽

10.1017/s0014479705003030 ◽

2006 ◽

Vol 42 (1) ◽

pp. 65-77 ◽

Cited By ~ 1

Author(s):

M. Z. ALAM ◽

T. STUCHBURY ◽

ROBERT E. L. NAYLOR

Keyword(s):

Seedling Growth ◽

Seed Quality ◽

Oryza Sativa L ◽

Germination Rate ◽

Seed Vigour ◽

Early Seedling Growth ◽

Early Seedling ◽

Controlled Deterioration ◽

Rice Genotypes ◽

Initial Seed

The response of germination and early seedling growth to levels of salinity (0, 50, 100, 150, 200 and 250 mM NaCl) were examined in single seed lots of ten modern rice genotypes. Unaged and deteriorated rice seeds were germinated in rolled paper towels and in Petri dishes. Initial seed quality, final germination, germination rate and early seedling growth were assessed. The samples of the rice genotypes differed in their initial seed quality (measured in terms of Ki). The effect of deterioration varied depending upon the initial seed quality and the severity of the treatment imposed. Ageing (using the technique of controlled deterioration, CD) for up to 24 h had no effect on final germination levels. Although CD for 30 h only reduced final germination slightly, ageing for 36 or 48 h reduced it greatly. Controlled deterioration for 36 h or longer reduced the final length and the rate of extension of both the plumule and radicle. Combining information about germination in salt solution with that about seed quality enabled a distinction to be made between varieties which performed poorly because they were genetically salt-susceptible from those which germinated poorly due to poor seed quality. It is argued that the seed vigour of seed lots used in genotype evaluation should be assessed in order to avoid discarding potentially useful genotypes because of poor physiological seed quality.

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