Abstract
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.
Highlights
Lima bean (Phaseolus lunatus L.) is an important crop for several countries, such as Peru, Colombia, Mexico, USA and Brazil (AMORIM et al, 2019)
UFPI-18 and UFPI-38 promoted the highest values of SDW
UFPI-38 and UFPI-18, in small seeds, and UFPI-59, in large seeds, increased the root growth when compared to NC, PC and CIAT899
Summary
Lima bean (Phaseolus lunatus L.) is an important crop for several countries, such as Peru, Colombia, Mexico, USA and Brazil (AMORIM et al, 2019). In Brazil, it is cultivated in the Northeastern region, mainly by small farmers, in an estimated area around 37,500 ha. Important for small farmers, lima bean still has low productivity and some reasons contribute to this situation, such as the absence of commercial varieties and low availability of nutrients, mainly nitrogen (N). Nitrogen is essential to plants and its supply to lima bean could contribute for increasing the yield (LOPES et al, 2015). Lima bean can associate with N-fixing rhizobia and through biological N fixation (BNF) uptake N for its growth and yield (AMORIM et al, 2019)
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