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Evaluation of techniques on breaking seed dormancy on four philippine inbred rice varieties

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Research Paper 01/09/2019
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Evaluation of techniques on breaking seed dormancy on four philippine inbred rice varieties

May Basco Divina, Khristina G. Judan Cruz
Int. J. Biosci.15( 3), 92-99, September 2019.
Certificate: IJB 2019 [Generate Certificate]
Key: ChemicalsDormancy-breakingGermination

Abstract

This study evaluated the efficiency of six dormancy – breaking techniques on the germination of the four inbred rice varieties (PSB Rc82, NSIC Rc160, NSIC Rc218, NSIC Rc222) through the measurement of root and shoot length. This provides information to researchers, rice farmers and breeders in identifying the most efficient breaking dormancy techniques for the four inbred rice varieties to address the challenge of long seed dormancy period. The techniques used were soaking with water, sun drying, dry heat method or oven drying and chemical treatments, potassium nitrate (KNO3) and gibberellic acid (GA3).  Results from the treatments showed that at the seventh day of germination, soaking in water, sun drying, oven drying, and chemical treatments have achieved more than 90% of germination rate.  Amongst the treatments, oven drying at 50°C for 5 days and the use of 100ppm gibberellic acid (GA3) are the most effective, while seeds germinated on control treatment had a comparatively low effect. Furthermore, the effects of these dormancy – breaking techniques on shoot and root length showed potassium nitrate could induce both root and shoot length while GA3 produced the least length on root. Soaking with water had the shortest shoot measured amongst the treatments. Germination rate is not correlated with the length of shoot and roots. KNO3 induced both root and shoot length. GA3 had the highest germination rate and shoot length, and performed least on root length.

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