Seed size influences the promoting activity of rhizobia on plant growth, nodulation and N fixation in lima bean

Abstract

This study evaluated the activity of rhizobia isolates inoculated in large (18 mm) and small (11 mm) seeds on lima bean growth, nodulation and N fixation. Selected rhizobia isolates were compared with a reference strain CIAT899 and two controls without inoculation. Large seeds contributed for highest plant growth, nodulation and N fixation than small seeds. The isolates UFPI-59, UFPI-18 and UFPI-38 promoted the highest values of shoot and root dry weight, respectively. The isolates UFPI-32 promoted the highest values of nodule number, while UFPI-59 promoted the highest values of nodule dry weight. The isolates UFPI-38 and UFPI-59 promoted the highest accumulation of N. This study showed that seed size really influences lima bean growth, nodulation and BNF. Considering rhizobia isolates, UFPI-59, UFPI-38, and UFPI-18 contributed for plant growth, promoted better nodulation and effectiveness on biological N fixation.

REACTIONS OF LIMA BEAN (Phaseolus lunatus L.) ACCESSIONS TO Colletotrichum truncatum

“…Phaseolus lunatus L., popularly known as lima bean, is a leguminous vegetable widely cultivated in tropical regions and constitutes an excellent source of food supply due to its vegetable protein potential, and also for its use as a complementary income to small producers (SOARES, 2010;LUCENA et al, 2018) In the United States, the world's largest lima bean producer, the grains are still commercialized as preserved green, such as in canned, packaged or frozen beans, which adds more value to the product. In Brazil, the consumption of lima bean is preferably in the form of cooked dried beans (BITENCOURT; SILVA, 2010), where it is cultivated in several states in the northeast region, responsible for 96% of the national production (COSTA et al, 2021). Paraíba state is the second producer after the Ceará state, with an average yield of 306 kg ha -1 (IBGE, 2020).…”

Diversity and biotechnological potential of rhizobia isolated from lima bean nodules collected at a semiarid region

“…Although lima bean has the important characteristic of establishing symbiosis with rhizobia (Araujo et al, 2015;Chibeba et al, 2020;Matsubara & Zúñiga-Dávila, 2015;Ormeño-Orrillo et al, 2006), the phenotypic and genotypic diversity and the symbiotic efficiency of rhizobia isolated from the nodules of this leguminous plant have not been widely studied. Only eight studies worldwide have genetically characterized isolates from lima bean nodules (Araujo et al, 2015;Chibeba et al, 2020;Durán et al, 2014;López-López et al, 2013;Matsubara & Zúñiga-Dávila, 2015;Ormeño-Orrillo et al, 2006;Rocha et al, 2020;Santos et al, 2011), and in Brazil, there have been only nine studies in relation to symbiosis between rhizobia and lima bean (Antunes et al, 2011;Araujo et al, 2015;Costa Amorim et al, 2019;Costa et al, 2021;Cubillos-Hinojosa et al, 2021;Neto et al, 2017;Rocha et al, 2019;Santos et al, 2011). However, only a few of these papers evaluated the efficiency of strains in symbiosis with lima bean.…”