Identification of Tropical Late Yellow Maize Under Water Stress Conditions
Drought is a limiting factor in maize producing area in Thailand. It damages an estimated annually 3％-22％ of the maize planted area, resulting in yield losses of approximately 129000 to 858000 metric tons. During the summer season of 2003～2004, tropical late yellow maize (Zea mays L.), including 41 inbreds, 36 hybrids and 35 open pollinated varieties (OPV), were evaluated in separate trials under water stress and nonstress conditions at Takfa, Nakhon Sawan. Treatments were arranged in randomized complete block design with three replications. The water stress experiment was managed by irrigation withdrawal achieving severe drought stress during flowering stage, whereas the non-stressed plot were well- watered by weekly irrigation. The objective was to compare the performance of tropical late yellow inbred, hybrid and OPV in order to identify the superi or germplasm for further use in hybrid development program. Significant differences (P(0.5) were detected among inbreds, hybrids and OPV for all traits measured. Mean grain yield (GY) of inbreds, hybrids and OPV averaged 772,3837 and 2388kg/ha and anthesis-silking interval (ASI) ranged from -0.3 to 10.0,0.0 to 6.3 and 0.0 to 12.0 days, respectively. GY correlated positively with ears per plant (EPP), CHE and SPR. It indicated that increase in GY under water stress was associated with increase EPP, chlorophyll content (CHE) and seed per row (SPR). The ASI and leaf rolling (LRO) was negatively correlated with GY, suggesting an increase in GY was associated with a reduction in ASI and LRO. Several inbreds, hybrids and OPV showed good performance under water stress condition. Four inbreds, one hybrid and two OPV had greater grain yield (GY) and number of ears plant-1 (Epp), but shorter ASI than overall mean.
Drought Maize Stress Anthesis-silking interval
Pichet Grudloyma T. Budthong N. Kamlar
Nakhon Sawan Field Crops Research Center, Takfa, Nakhon Sawan, 60190, Thailand
国际会议
第九届亚洲玉米大会(the Ninth Asian Regional Maize Workshop)
北京
英文
132-135
2005-09-05（万方平台首次上网日期，不代表论文的发表时间）