| 000 | 02812nab a22003017a 4500 | ||
|---|---|---|---|
| 999 |
_c58561 _d58553 |
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| 001 | 58561 | ||
| 003 | MX-TxCIM | ||
| 005 | 20211110153730.0 | ||
| 008 | 160212s2017 xxu|||p|op||| 00| 0 eng d | ||
| 024 | 8 | _ahttps://doi.org/10.1111/jac.12196 | |
| 040 | _aMX-TxCIM | ||
| 041 | _aeng | ||
| 100 | 1 |
_94720 _aCabrera-Bosquet, L. |
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| 245 | 1 | 0 | _aKernel 18 O reflects changes in apical dominance and plant transpiration in tropical maize |
| 260 |
_aUSA : _bWiley-Blackwell, _c2017. |
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| 500 | _aPeer review | ||
| 520 | _aModification of source–sink ratios in tropical maize through detasseling is an ancestral agronomical practice used for increasing yields under stressful conditions. However, the mechanisms behind such effect are not well understood given the difficulties to determine physiological processes such as photosynthesis and whole-plant transpiration in the field. We have tested the potential ability of kernel δ18O to assess differences in grain yield (GY) through changes in plant transpiration caused by the modification of water availability and source–sink modification treatments, (including removal of the tassel and different numbers of leaves) in three tropical maize hybrids differing in drought tolerance. Drought-tolerant genotypes displayed higher yields and lower kernel δ18O values than the drought-susceptible genotype under both well-watered (WW) and water-stressed (WS) conditions. Detasseling caused a positive increase in GY under well-watered (up to 8%) and water-deficit conditions (up to 36%). Reduction in leaf area (source) through defoliation treatments caused a large impact on GY showing a trade-off between maintaining a photosynthetic versus transpiring leaf area. Thus, while a reasonable reduction in leaf area significantly improved plant water availability (as shown by lower kernel δ18O values) and consequently GY under water deficit (up to 40%), it caused a maximum reduction of 25% in GY under well-watered conditions. Variations in GY were significantly (p < .05) correlated with changes in δ18O under both well-watered (r = −.67) and WS conditions (r = .75 and .82). Our results also reinforce the utility of δ18O measured in mature kernels as a powerful ecophysiological tool for assessing genotypic differences in apical dominance, transpiration and yield under both WW and WS conditions in tropical maize. | ||
| 546 | _aText in English | ||
| 650 | 7 |
_91168 _aKernels _gAGROVOC |
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| 650 | 7 |
_aMaize _gAGROVOC _2 _91173 |
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| 650 | 0 |
_94721 _aTranspiration |
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| 700 | 1 |
_94722 _aGrieder, C. |
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| 700 | 1 |
_94724 _aAlvarez Prado, S. |
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| 700 | 1 |
_aSánchez, C. _94725 |
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| 700 | 1 |
_91436 _aAraus, J.L. |
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| 773 | 0 |
_wu444504 _x0931-2250 (Print) _dUSA : Wiley-Blackwell _tJournal of Agronomy and Crop Science _gv. 203, no. 4, p. 277-285 |
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| 942 |
_2ddc _cJA |
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