Academic Journal
GAS EXCHANGE AND PHOTOCHEMICAL EFFICIENCY IN LIMA BEAN GENOTYPES GROWN IN COMPACTED SOILS1
| العنوان: | GAS EXCHANGE AND PHOTOCHEMICAL EFFICIENCY IN LIMA BEAN GENOTYPES GROWN IN COMPACTED SOILS1 |
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| المؤلفون: | RENATO FRANCISCO DA SILVA SOUZA, DJAIL SANTOS, WALTER ESFRAIN PEREIRA, FABRÍCIO LOPES DE MACEDO, JHONY VENDRUSCOLO |
| المصدر: | Revista Caatinga, Vol 31, Iss 2, Pp 306-314 (2018) |
| بيانات النشر: | Universidade Federal Rural do Semi-Árido, 2018. |
| سنة النشر: | 2018 |
| المجموعة: | LCC:Agriculture LCC:Biology (General) |
| مصطلحات موضوعية: | Agriculture, Biology (General), QH301-705.5 |
| الوصف: | The effects of soil compaction on crop growth and productivity have been well studied in recent years, however, studies on the physiological responses of crops to compaction are scarce. The objective of this study was to evaluate the effect of soil compaction on gas exchange, and photochemical efficiency of lima bean (Phaseolus lunatus L.) genotypes of different growth habits. The experimental design was a randomized block in a 3×4 factorial arrangement, with three lima bean genotypes (Branca-Pequena, Orelha-de-Vó and Roxinha) and four compaction levels (soil densities of 1.1, 1.3, 1.5 and 1.7 g cm-3), with four replications. The following variables were evaluated at 38 days after sowing: photosynthetic rate (A), leaf transpiration (E), stomatal conductance (gs), internal CO2 concentration (Ci), instantaneous water use efficiency (WUE), intrinsic water use efficiency (iWUE), instantaneous carboxylation efficiency (iCE) and photochemical efficiency (Fo, Fm, Fv and Fv/Fm). The data were subjected to analysis of variance at 5% probability by the F test. The genotypes showed a reduction in the photosynthetic rate with increasing soil compaction. The soil compaction affected the photochemical efficiency of the genotype Orelha-de-Vó, with the Fm and Fv fitting to the linear model, and the Fv/Fm fitting to the quadratic model. The genotype Orelha-de-Vó had the highest rate of E and gs at the soil densities of 1.24 and 1.29 g cm-3, respectively. Regarding the photosynthetic rate, the genotype Roxinha is more efficient than Branca-Pequena at the soil density of 1.7 g cm -3. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 0100-316X 1983-2125 |
| Relation: | http://www.redalyc.org/articulo.oa?id=237158160006; https://doaj.org/toc/0100-316X; https://doaj.org/toc/1983-2125 |
| DOI: | 10.1590/1983-21252018v31n206rc |
| URL الوصول: | https://doaj.org/article/e6dd5c88752a44aa8a114220fe542b0b |
| رقم الانضمام: | edsdoj.6dd5c88752a44aa8a114220fe542b0b |
| قاعدة البيانات: | Directory of Open Access Journals |
| تدمد: | 0100316X 19832125 |
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| DOI: | 10.1590/1983-21252018v31n206rc |