Performance of Elite Maize lines and Hybrids Under Drought Stress in Vietnam
During 2000～2002, a set of 49 maize lines including 27 normal (S5) and 8 QPM lines from CIMMYT and 10 normal lines from Vietnam along with 4 parents of two commercial hybrids were evaluated at high (95000plants/ha) and normal densities (71000plants/ha) under rain-fed conditions across Northeast and the Red river delta. Under high density, correlation coefficient (r) between grain yield and kernel setting, ears per plant, ear aspect and anthesis-silking interval was 0.78, 0.76, -0.77 and -0.75, respectively. However, under normal plant density the correlations were relatively lower, i.e. -0.458, 0.564, -0.454 and -0.305. Applying a selection index 14 lines with relatively superior performance both the densities were elected, including TCH3, TCH4, TCH8, TCH12, TCH13, TCH14, TCH15, TCH16, TCH21 CML52), TCH31, TCH38, DF5 (check 2), DF7 (check 1 ), and DF2 (Check 4). Stability analysis for yield across locations showed that TCH12, TCH14, TCH31 and TCH38 had a regression coefficient close to 1 with little deviation from the regression. Furthermore, these 4 lines showed good level of drought tolerance, similar to CML-52 (CIMMYT check). Among the hybrids, HQ2000 (CML161×CML165) and LCH9 (CML161×TCH38) showed good drought tolerant characteristics in terms of drought index in comparison to DK999 (Check). The drought tolerance characteristics gave an edge to these two hybrids over many new high yielding normal hybrids, as the acreage HQ2000 gone up to 25,000ha and above 400ha for LCH9. It is concluded that TCH31 (CML161) and TCH38 are drought tolerant lines and good combiner for rain-fed conditions.
Maize lines Hybrids under drought stress
Le Quy Kha Do Tuan Khiem Nguyen The Hung Chau Ngoc Ly Phan Xuan Hao
National Maize Research Institute of Vietnam, Vietnam Thai Nguyen Agro-Forestry University, Vietnam Ha Noi Agricultural University, Vietnam
国际会议
第九届亚洲玉米大会(the Ninth Asian Regional Maize Workshop)
北京
英文
206-211
2005-09-05（万方平台首次上网日期，不代表论文的发表时间）