Improvement of Seedling Establishment of Wet Seeded Rice Using Ga3 and Iba as Seed Treatment

Abstract

Direct seeding has some advantages compared to transplanting system in rice, however there are some constraints need to be addressed. One constraint generally faced in the wet seeded rice is poor stand establishment. The experiment was conducted to improve seedling establishment by using selected growth regulators. Seeds of four rice cultivars, i.e. Memberamo, Widas, MR 84, and MR 219 were treated with GA3 (gibberellic acid-3) of 25, 50, and 100 mg 1-1, and IBA (indole-3 butyric acid) of 10, 20, and 40 mg l-1. Results showed that cultivar response to GA3 was similar in all parameters observed, however the response of cultivars to IBA was different at the initial stage. In Indonesian cultivars (Memberamo and Widas), shoot length of IBA treated seedlings was comparable to the control, but the IBA treated seedlings of Malaysian cultivars (MR 84 and MR 219) had slightly shorter shoots compared to the control. GA3 as seed treatment induced favorable early emergence and shoot growth in the initial stage, but the shoots were etiolated and resulted in susceptible to lodging even in the vegetative stage. In comparison, exogenous application of IBA resulted in high number of adventitious roots contributing towards better establishment of seedling with broader and greener leaves. The growth regulator was lost its effect by 2 or 3 weeks after sowing. All IBA concentrations also did not show any significant differences on growth parameters or have any detrimental effect on grain yield in all cultivar tested. IBA 10 mg l-1 was sufficient in providing the required improvement in the rice seedlings.

Effect of the Seed Priming and Duration on the Seed Germination and Seedling Vigor of Sunflower Crop

“…The reason may be due to that the priming with gibberellin enhanced the endogenous gibberellin, which led to the accumulation of mRNA nucleic acids. Then, the formation of glucose from the digestion of starch by synthesizing the degradation enzymes Alpha-amylase, which improves the synthesis of sucrose used for growth, this effect is reflected on plumule, as gibberellin contributes to activating the processes of division and elongation (Wahyuni et al, 2016). This result agreed with (Saudi, 2012;Jiyad, 2008;Jadoua and Silawi 2012) indicated that the gibberellin increased the plumule length for the sunflower, sorghum, and rice seedling.…”

Quantitative assessment of indica rice germination to hydropriming, hormonal priming and polyethylen glycol priming

“…In the mentioned study, salicylic acid at 150 mg L -1 was introduced to be used as hormonal priming for higher productivity of MR219 rice in Malaysia (Kareem et al, 2013). In contrast to the above results, Wahyuni et al (2013) reported that different responses of MR219 and MR84 rice varieties to various priming treatments depended on several factors such as sowing time, interaction between plant growth regulator and variety, as well as priming stages. In another study, cowpea seed treated with 5 mg L -1 G 3 A 3 and IAA displayed a significant increase in seedling growth and germination percentage cowpea.…”