Journal of Agriculture & Life Sciences

Characterization of Tolerant Upland Rice to Drought on Rooting and Physiology System
Laila Nazirah, Edison Purba, Chairani Hanum, Abdul Rauf

Abstract
This study aims to determine the efficiency of water use between cultivars and identify the root system, droughttolerant upland rice physiology. Implemented in plastic house in North Aceh, in January 2015 until May 2015. Using a split plot design (Split-plot) with three replications, and two factors: The first factor is drought stress (C) consisting of 4 levels of field capacity is : C1: 20% (300 ml / day), C2: 40% (600 ml / day), C3: 60% (900 ml / day) and the C4: 80% (1200 ml / day). The second factor is the 10 varieties of upland rice varieties consists of 3 groups (the result of screening with PEG 6000), namely (tolerant varieties) consists of Inpago 9, Inpago 4, Inpago 8. (moderate varieties) which consists of Inpago 5, Situ Bangendit, Inpago7, Towuti, and (sensitive varieties) which consists of Inpari 6 JATE, Inpari 33 and Sintanur. Materials used are topsoil, manure, Phonska + Urea compound fertilizer dose (300 kg / ha + Urea 200 kg / ha), polybags size 40 cm x 50 cm. The tools used include: Soil pH and DM 15 Mouisture Tester, Digital Thermometer, Chlorophyll Meter SPAD, Spectrophotometer, meter, digital scales, label, signage and all the tools that support research. Drought stress causes decreased root weight, root crown ratio, proline content of leaves and total leaf chlorophyll, but led to increased root length. Results of the study showed avoidance mechanism varieties tolerant to drought stress in different ways varieties Inpago 4 through increasing root length, root weight, root crown ratio and the amount of leaf proline. Ciapus varieties through an increase in the amount of chlorophyll. Moderate varieties Inpago 7, situbangendit unidentified able to adapt to the conditions of drought stress on field capacity 20% and 40% on content of proline and root length. Susceptible Inpari varieties 6 jete and Inpari 33 gave the highest content of chlorophyll and proline.

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