Drought tolerance of selected Korean rice varieties under vegetative stage soil moisture deficits

Issue Date

7-2018

Abstract

In the Philippines, high yielding Korean rice varieties received higher acceptable rating over that of local varieties in terms of grain and cooking qualities. Philippines has rainfed environments that are highly variable, breeding rice for drought-prone rainfed ecosystems requires genotypes that combine high yielding ability with good drought adaptation ability. Dry matter production under drought is a product between water use (WU) and water use efficiency (WUE). Thus, this study aimed to evaluate the relationship between dry matter with WU and WUE of five Korean rice varieties under drought stress. Five Korean varieties such as Dasanbyeo, Gayabyeo, Hanareum2, Milyang 23 and Saegyejinmi together with IR64 were grown in pots for 45 days and subjected to two water treatments: well-watered (WW) and progressive drought (PDR, 10% SMC). Under drought, 3 out of 5 Korean varieties such as Dasanbyeo, Hanareum2 and Saegyejinmi had significant increases in shoot dry weight (SDW) relative to WW while the rest had reductions. Total leaf area also showed similar pattern of response with that of SDW. WU was significantly different among the varieties and had significant relationship with the varietal differences in total root length. Correlation analyses showed that the varietal differences in SDW under drought had negative relationship with WU while it had positive relationship with WUE. Overall, initial results showed that some Korean varieties had the ability to maintain higher dry matter production under drought. Such ability for higher dry matter production was greatly contributed by their ability to maintain high WUE rather than WU. And thus, their drought tolerance ability was greatly contributed by shoot related traits rather than by root related straits. Further studies are being done to further characterize their root system developmental responses along the soil profile and photosynthetic efficiencies during drought stress.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463X

Volume

43

Issue

Supplement no. 1

Page

70

Document Type

Article

Language

English

Subject

Oryza sativa L.; Rice varieties; Drought-tolerant plants

En – AGROVOC descriptors

ORYZA SATIVA; VARIETIES; DROUGHT RESISTANCE; DROUGHT STRESS; DROUGHT; SOIL WATER CONTENT; EFFICIENCY; WATER USE

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