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Effects of moisture stress on yield, components of yield, vegetative growth components and their interrelationships in corn (Zea mays L.)
| Content Provider | Semantic Scholar |
|---|---|
| Author | Siebert, Jay Dee. |
| Copyright Year | 1978 |
| Abstract | Ten selected corn genotypes were grown under three water regimes, two densities and at two locations to determine which plant traits could be used as basis for selection for high yield in a stress environment. Grain yield (Kg/ha), yield per plant (gms/plant), averge number ears per plant, barreness rating, prolificacy rating, average kernel number per ear and average kernel weight all responded negatively to moisture stress. The highly positive correlation of average kernel number per ear to grain yield was found to be useful in predicting yield within an environmental situation. Average kernel weight showed a compensatory response to low average kernel number per ear but did not predict yield. Average number ears per plant, barreness rating and prolificacy rating were positively and highly correlated with yield under stress conditions. Prolifacacy rating, under non-stress showed some predictive potential for yield under stress. A parallel response for yield per plant, among all genotypes, to moisture stress and density stress indicates selection for stable performance at high density could serve as an effective selection scheme for moisture stress. Vegetative growth components of leaf area per plant (m2/plant) , dead leaf number, functional green leaf number and yield efficiency (gms/m2 leaf area) were measured prior to flowering and during the grain fill period. Dead leaf counts indicated that early leaf senescence (hastened physiological maturity) severely limited grain yield in the stress plots. Genotypes with large leaf areas were most susceptible to leaf senescence under stress environments. Yield efficiency, which incorporated average kernel number per ear trends and leaf area per plant, was positively and highly correlated with grain yield in all environments. Regression models indicated that genotypes with high yield efficiency, when combined with average or large leaf area per plant, would produce the highest grain yield in both stress and non-stress environments. Additional index words: Water stress, Grain yield, Yield components, Leaf senescence, Leaf area per plant, Yield efficiency |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://krex.k-state.edu/dspace/bitstream/handle/2097/26968/LD2668T41978S563.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
