Effect of Plant Growth Regulators on Growth and Yield of Egyptian Hybrid Rice One Under Saline Soil Conditions

Abstract

Two field experiments were conducted under saline soil during 2013 and 2014 seasons at Research Farm of El Sirw Agricultural Research Station, Damietta province, Egypt. Improving salinity tolerance and grain yield of hybrid rice were the main objectives of the current study. The experimental soil was clayey with salinity levels of 7.70 and 7.30 dS/m in 2013 and 2014 seasons, respectively. Egyptian hybrid rice one (EHR1) variety was used in this study. The studied treatments were including; water (spray control treatment), GA 3 with concentration (5, 10, 15 ppm), Auxin with concentration (5, 10, 15 ppm), Cytokinin with concentration (5, 10, 15 ppm). Those substances were sprayed at mid tillering, panicle initiation and booing stage. At heading the growth parameters of EHR1 was measured at heading stage as well as plant chemical contents were estimated. Grain yield and its components were estimated at harvest. The factorial design was used in the experiment with three replications. The obtained results showed that foliar spray treatments were found to be increased effective in enhancing growth plants of EHR1 and increased nutrient leaf content such as N and K. therefore, the salinity withstanding of EHR1 was raised resulted in proper growth and reasonable grain yield under salt stress. Applying Cytokinin or Auxin at 10 ppm as foliar application was most effective treatment in improving rice productivity under salt affective soils.

Effect of Gibberellic Acid and Potassium Applications in Improving Salinity Tolerance of Three Rice Cultivars

“…The Superiority of GA 3 + K 2 O treatment (T 4 ) in increasing K and Na ,as well as, reducing Na + /K + ratio under salinity stress could be mainly attributed to the positive effect of GA 3 and K 2 O in enhancing nutrients absorption and translocation by rice plants (Wang et al, 2013). The current findings are in coincidence with those reported by Baskar et al,(2000), Hong and Wang (2004), Pandey et al, (2007), Reddy et al, (2009), Bassiouni et al, (2011), and Zayed (2012). Effect of the interaction: Table (8) showed that, both potassium content and sodium/potassium ratio were significantly affected by the interaction between GA 3 and K 2 O applications ,as well as, rice cultivars in both seasons of study.…”

“…Furthermore, .this increasing in proline content with Giza 178 rice cultivar could be indicator for salinity tolerance. These varietals' differences had, also, been pointed out by several researchers, such as Bassiouni et al, (2011) and Zayed et al (2012).…”

Ameliorative Effect of GA3 as Foliar Spray Treatment on Performances of Salt-Stressed Damsisa (Ambrosia maritima L.) Plants

“…Therefore, several methods have been tested for improving salt tolerance of plants. GA 3 was recommended as an effective agent for increasing salt and drought tolerance of plants, El-Ekhtyar et al (2014), Bassiouni et al (2016), Ullah et al (2018), Rathinavelu et al (2018) and Rady et al (2021).…”