Latest Research News on Seedling Growth: Feb – 2020

Salinity Effects on Seedling Growth and Yield Components of Rice

Flood irrigation practices that are commonly utilized in California during the first stages of rice (Oryza sativa L.) establishment may contribute to salinity damage and eventually decrease yield. Knowledge of salinity effects on rice seedling growth and yield components would improve management practices in fields and increase our understanding of salt tolerance mechanisms in rice. Salinity sensitivity of rice was studied to work out salinity effects on seedlings and yield components. Plants of rice cultivar M-202 were grown during a greenhouse in sand and irrigated with nutrient solutions of control and coverings amended with NaCl and CaCl2 (2:1 molar concentration) at 1.9, 3.4, 4.5, 6.1, 7.9, and 11.5 dS m−1 electrical conductivity. Shoot dry weights of seedlings were measured at five harvests within the first month after seeding. Seedling growth was significantly reduced by salinity at rock bottom salinity treatment, 1.9 dS m−1. At 1.9 and 3.4 dS m−1, significant reduction of seedling growth occurred at longer cumulative thermal time than at higher salt levels. Seedling survival was significantly reduced when salinity was 3.40 dS m−1 and better . Highly significant linear responses of grain weight per plant, grain weight per panicle, spikelet number per panicle, and tiller number per plant to salinity were observed. [1]

Germination and seedling growth of cotton: salinity‐calcium interactions

The effects of NaCl salinity on germination and early seedling growth of cotton were studied. Germination was both delayed and reduced by 200 mol m−3 NaCl within the presence of an entire nutrient medium. Seedlings, 7–9 d old, were greatly reduced in fresh weight by salinity. The addition of supplemental Ca2+ (10 mol m−3 as SO42− or Cl−) to the medium didn’t improve germination but, to an outsized degree, offset the reduction in root growth caused by NaCl. Roots growing within the high salt medium without supplemental Ca2+ appeared infected by microbes. The cation specificity of the beneficial Ca2+ effect on growth was ascertained by testing additions of MgSO4 or KCl to the NaCl treatments. The contents of K4 and Ca2+ were reduced in both roots and shoots by the NaCl treatments. Supplemental Ca2+ partially offset this effect for K4 within the roots and for Ca2+ in both roots and shoots. Sodium contents weren’t suffering from the supplemental Ca2+. it’s concluded that the beneficial effect of high Ca2+ concentrations on root growth of cotton seedlings during a saline environment could also be thanks to maintenance of K/Na‐selectivity and adequate Ca status within the root. [2]

Effect of Salinity on Germination and Seedling Growth of twoAtriplexspecies (Chenopodiaceae)

Salinity is one among the environmental factors that features a critical influence on the germination of halophyte seeds and plant establishment. Salinity affects imbibition, germination and root elongation. However, the way during which NaCl exerts its influence on these vital processes, whether it’s through an osmotic effect or a selected ion toxicity, remains not resolved. Dimorphic seeds of the halophytesAtriplex prostrataandA. patulawere treated with various iso-osmotic solutions of NaCl and polyethylene glycol (PEG). for every treatment, imbibition, germination rate, percent germination, germination recovery and nuclear area of root tip cells were compared. Higher concentrations of NaCl (-1.0 MPa) were more inhibitory to imbibition, germination and seedling root elongation than iso-osmotic PEG solutions. [3]

Growth performance and emergence of invasive alien Rumex confertus in different soil types

Rumex confertus is understood to be one among the foremost serious invasive weed species infesting meadows, pastures and ruderal lands throughout the Central Europe. Rumex confertus was grown in pot experiments using 8 soil types at 5 concentrations of nitrogen (N) and phosphorus (P). supported harvest data, the variables, seedlings emergence, root: shoot (R: S) ratio, N and P concentration, chlorophyll content, Relative Colimitation Index (RCI) and dry matter allocation to plant components, were determined. N and P addition stimulated the expansion of plants in several soils, as reflected by a big increase in seedling growth parameters like total plant biomass and shoot biomass. Across all soil types, emergence of seedlings was negatively suffering from very high N, but positively suffering from increased P availability. [4]

Sunflower Seed-priming with Phosphate Salts and Seedling Growth under Salt Stress

Aims: it had been assumed that halo-priming process under salinity stress may believe phosphorus nutrient source. Nutrient priming of seeds of sunflower seeds could also be beneficial for growth of seedlings under salt stress.

Study Design: Laid out the experiment in Complete Randomized Design, using NaCl @ 0, 15, 30, 45 and 60 mM on prime seeds from two sources of phosphorus salts in quadruplication.

Place and Duration of Study: The study was conducted in laboratory of Soil Salinity Research Programme of natural resource Research Institute at National Agricultural research Centre, Islamabad, Pakistan during the amount from July to September, 2016. [5]

Reference

[1] Zeng, L. and Shannon, M.C., 2000. Salinity effects on seedling growth and yield components of rice. (Web Link)

[2] Kent, L.M. and Läuchli, A., 1985. Germination and seedling growth of cotton: Salinity‐calcium interactions. Plant, Cell & Environment, 8(2), (Web Link)

[3] KATEMBE, W.J., UNGAR, I.A. and MITCHELL, J.P., 1998. Effect of salinity on germination and seedling growth of twoAtriplexspecies (Chenopodiaceae). Annals of Botany, 82(2), (Web Link)

[4] Growth performance and emergence of invasive alien Rumex confertus in different soil types
Jeremi Kołodziejek
Scientific Reports volume 9, (Web Link)

[5] uz-Zaman, B.-, Ali, A., Akram, M., Ali Mahmood, I., Arshadullah, M. and Tabassam, T. (2017) “Sunflower Seed-priming with Phosphate Salts and Seedling Growth under Salt Stress”, Asian Research Journal of Agriculture, 3(4), (Web Link)

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