The mechanisms underlying melatonin improved soybean seedling growth at different nitrogen levels

ABSTRACT: The differentiation of seedling growth and development is the result of the vigor level of the seed lot. Because of this, knowing the seedling growth curve is essential for the evaluation of the seedling length test, to be carried out at the moment when any differences in vigor really manifest, thus being able to reduce the time of evaluation of the test. In this research, the objective was to determine the most efficient time interval to perform the seedling length test in soybean seeds, depending on the vigor levels. The evaluated characteristics were percentage of seed germination, first germination count, emergency, days for emergence, aerial, root and total length (evaluated every 12 hours), aerial, root and total dry mass in completely randomized design. High vigor seeds originated seedlings with higher growth rates (cm. h-1), with vigor being one of the factors that interfere in the seedling length test. After 96 hours of the seedling length test, there was a statistical differentiation between the three vigor levels tested. The soybean seedling length test between lots, with different vigor, can be performed 96 hours after sowing.

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Dimethipin (2,3-Dihydro-5,6-dimethyl-1,4-dithiin 1,1,4,4-tetraoxide) Effects on Soybean Seedling Growth and Metabolism

Plant and Cell Physiology ◽

10.1093/oxfordjournals.pcp.a076727 ◽

1984 ◽

Keyword(s):

Seedling Growth ◽

Soybean Seedling

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Identification of biotinylated proteins in soybean [Glycine max (L.) Merrill] seeds and their characterization during germination and seedling growth

Seed Science Research ◽

10.1017/s0960258500003779 ◽

1997 ◽

Vol 7 (4) ◽

pp. 373-376 ◽

Cited By ~ 6

Author(s):

Robert G. Shatters ◽

Soon P. Boo ◽

José B. França Neto ◽

S. H. West

Keyword(s):

Seedling Growth ◽

Biologically Active ◽

Soybean Seeds ◽

Soybean Seedling ◽

Prosthetic Group ◽

Embryonic Axes ◽

Plant Parts ◽

Early Seedling Growth ◽

Glycine Max L ◽

Early Seedling

AbstractBiotin is an important vitamin. It is biologically active as a protein prosthetic group, where it functions in enzymatically catalysed carboxylation reactions. It has previously been shown that the ability to synthesize biotin is not necessary for germination of Arabidopsis thaliana seeds, but that this process is required for early seedling growth. This research was conducted to determine if changes in the detection of biotinylated proteins could be observed that reflect changes in the need for biotin-mediated enzyme reactions observed during early soybean seedling growth. A seed specific 75-kDa biotinylated protein present in the embryonic axes and the cotyledons was lost during the first 3 d of germination. Seed specificity, and pattern of expression during germination suggest that this protein is a homologue of the seed specific 65-kDa biotinylated protein previously identified in pea (Pisum sativum). If samples were not treated with 2-mercaptoethanol, three equally spaced proteins at approx. 85 kDa were visible. In the presence of 2-ME these proteins appeared as a single 85-kDa band. This triplet was distinct only in the embryonic axes of dry seeds and not in imbibed seeds or in other plant parts. This demonstrates that imbibitional changes do occur in the pool of biotinylated proteins present in dry soybean seeds, and that 2-ME treatment can inhibit complete identification of the biotinylated proteins present in seed tissues.

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