Root Characther of Drought Tolerant Rice In Lowland System

maisura, maisura (2015) Root Characther of Drought Tolerant Rice In Lowland System. In: Proceedings of The 1 th Almuslim International Conference on Science, Technology and Society (AICSTS), 7-8 November 2015, Universitas Almuslim.

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Abstract

The objective of this research is to identify the characters of the root of rice that tolerance to drought stress. This research was done in the Rice Research Field, University Farm IPB, Bogor (± 240 m ASL). The research used a split plot design with three replications with drought stress as the main plots and variety as the subplots.The main plot consisting of drought stress at 3 Weeks After Transplanting (3 WAT) until the age of 7 WAT, and control (K0), whereas the subplot consisted of rice varieties namely IR 64, Ciherang, IPB 3S, Way Apo Buru, Jatiluhur, Menthik Wangi, Silugonggo and Rokan. The results showed that drought stress inhibits root development either vertically or horizontally at 0-10 cm, 10-20 cm, 20-30 cm and 30-40 cm depth. Decreased total root weight, root depth of achievement. Decrease in total dry weight of the roots is less due to drought stress on the Jatiluhur and IPB 3S varieties (12.41%, 36.41% respectively). The highest increasing in root depth achived by Way Apo Buru (46.05 cm) followed by IPB 3S (37.05 cm) varieties. Drought tolerance index was positively correlated with total root dry weight and relative leaf water content, and negatively correlated with the shoot root rasio. Total root dry weight, root depth, shoot root rasio during drought stress can be used as selection criteria for drought tolerant varieties. Keywords: Drought stress, rootbox, root distribution

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