The effect of Gibberellic Acid (GA3) on some morphological qualities of hybrid rice parental line.

Subject Areas :

Amir Abbas  moosavi mirkalaei ¹ (Young Researchers Clup and Scientific Board of Islamic Azad University, Chalous and Nowshahar Branch)
Mohammad Zaman  Noori ² (Scientific Board of Rice Research Institute, Amol)
Mortaza  Sam Daliri ³ (Scientific Board of Islamic Azad University, Chalous and Nowshahar Branch)
Haydeh  mehrai ⁴ (Scientific Board of Islamic Azad University, Chalous and Nowshahar Branch)

Received: 2007-11-03 Accepted : 2008-02-02 Published : 2008-01-21

Keywords: Gibberellic acid, hybrid rice, Parental Lines, Sterile Male Lines,

Abstract :

A factorial experiment based on completely randomized design was carried out to study the effect of Gibberellic acid on morphological qualities of hybrid rice parental lines in spring 2006. The study was done in a three hectares field in Amol. In this investigation, the male sterile line, IR58025A, accompanied by the male sterile line restoring, IR58025B, were planted in the proportion of 6:2 and 8:2. At blossom, flag leaf cut and GA3 hormone spraying with different viscosities were used as treatments. The results of variance analysis showed significant differences among different plots, and the two A and B parents. Comparison of means showed that flag leaf cut had a significant effect on the height of bushes and an important role in seed filling. Also with regards to seed filling, 150gm hormone per hectare was significantly more influential than 60 gm. This result proved the role of higher doses of hormone in seed filling. No differences were observed between planting proportions of 6:2 and 8:2.

References:

1. Jagadeeswari, P., S.P. Sharma and M. Dadlani. 2004. Effect of different chemicals on traits favoring outcrossing and optimization of GA3 for seed production of cytoplasmic male sterile line in hybrid rice. Seed science and Technology. Vol. 32, No. 2.

2. Janaiah, A. and M. Hossain. 2000. Hybrid rice for food security in the tropics: An evaluation of farm-level experiences in India. Paper presented at the 3rd International Crop Science Congress held in Hamburg, Germany, 17-22 August 2000.

3. Mao, C. X. 2001. Improving seed production to speed up the global commercialization by hybrid rice. 2001. In: S. Peng and B. Hardy (Eds.), Rice research for food security and poverty alleviation. Proceedings of the International Rice Research Conference, 31 March-3 April 2000. International Rice Research Institute, Los Banos, Laguna, Philippines. 692 pp.

4.Virmani, S. S., J. Manalo and R. Toledo. 1993. A self-sustaining system for hybrid rice seed production. International Rice Research Newsletter 18: 4-5.

5.Virmani, S.S. 1994. Heterosis and hybrid rice breeding. In: S.S. Virmani (Ed.), Monographs on theoretical and applied genetics 22, Springer-Verlag.

6.Virmani, S. S. 1996. Hybrid Rice. Adv. Agron. 57: 378-462.

7.Virmani, S. S., Mao, R. S. Toledo, M. Hossain and A. Janaiah. 2002. Hybrid rice seed production technology and its impact on seed industries and rural employment opportunities in Asia. IRRI.

8.Virmani, S. S. and H. L. Sharma. 1993. Manual for hybrid rice seed Production. International Rice Research Institute, Los Banos, Laguna, Philippines.

9.Yuan, L. P. 1994. Purification and production of foundation seed of rice PGMS and TGMS lines. Hybrid Rice 6: 1-2.