Effect of Rhizobium Sp. Inoculation on N2-Fixing and Photosynthetic Activities of Two Cowpea [Vigna unguiculata (L.) Walp.] Genotypes |
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Authors: | Lippi D De Paolis MR Osmi M Pietrini F Pietrosanti T Villani MC Massacci A |
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Institution: | (1) Plant Biochemistry and Ecophysiology Institute, National Research Council, Research Area of Rome, Via Salaria Km 29,300, 00016 Monterotondo Scalo, Rome, Italy e-mail |
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Abstract: | Time course of symbiotic N2-fixing and photosynthetic activities during vegetative growth from 30 d after plantation until pod set was measured in the
CB5 and 7964 cowpea Vigna unguiculata (L.) Walp.] genotypes of contrasting senescence traits. At emergence, seedlings were inoculated with a "non-cowpea miscellany"
Rhizobium strain generally used to inoculate Cicer arietinum. Maximum N2-fixing activity occurred in inoculated CB5 and 7964 plants about 54 and 68 d after plantation, respectively. A similar temporal
shift of maximum was found for net photosynthetic rate (P
N), confirming a good coordination between the two processes. A higher P
N was found from the first measurements in inoculated plants of both genotypes as compared with uninoculated plants. Apparently,
the maximum activity of both N2-fixation and P
N was timed to occur at a particular stage of plant ontogeny correlating the high N supply with the high N demand by the plant.
Rhizobium inoculation did not significantly affect partitioning coefficients of biomass to various plant organs but extended leaf longevity
by about 10 d in the CB5 genotype, retarding thus the monocarpic senescence.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | acetylene reduction leaf area monocarpic senescence plant ontogeny ureides |
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