Increased drought in many parts of the world is a major cause of promoting the projects and researches to
develop  drought-resistant  crops  with  high  productivity.  A  great  deal  of  researches  focused  on  identifying
morphological characteristics, biochemical and physiological parameters. Besides, studies on the nature of drought
tolerance at the molecular level have been scientists’ interest. Drought tolerance of 25 local upland rice varieties at
the seedling stage was identified, wherein Giang Bau was found to show the best drought tolerance variety while
Khau lay khao exhibited lowest degree of drought tolerance. The use of RAPD marker with 20 random primers
revealed genetic relationship of 25 local upland rice varieties with the coefficients of similarity among upland rice
cultivars  ranging  from  79%  to  92%.  LTP  coding  genes  of  two  local  upland  rice  varieties  with  different  drought
resistance was isolated and identified. The comparison and analysis of LTP gene sequences among two local upland
rice varieties (Giang bau and Khau lay khao) and a Japanese rice variety (Yukihikari) showed that the genetic
similarity of LTP gene sequences between Yukihikari and Giang bau is 100% and the genetic similarity of LTP gene
sequences between Giang bau and Khau lay khao is 98.1%. Comparing amino acid sequences of LTP proteins
among these three varieties showed an increase of amino acid valine residue in Khau lay khao’s LTP protein and an
increase of the amino acid leucine residue in Giang bau’s LTP protein.

Tải file Khả năng chịu hạn của một số giống lúa cạn địa phương (Oryza sativa L.) tại đây