Variability of nodulation and dinitrogen fixation capacity among soybean cultivars |
| |
Authors: | M Hungria T R J Bohrer |
| |
Institution: | (1) Embrapa-Soja, Cx. Postal 231, 86001-970, Londrina, PR, Brazil, BR |
| |
Abstract: | In order to identify soybean cultivars with higher biological N2 fixation capacities, North American and Brazilian soybean Glycine max (L.) Merrill] cultivars, belonging to maturity groups VI–VIII, were evaluated for nodulation parameters and N2 fixation rates. The symbiotic performance of 152 cultivars was evaluated in pots containing 4 kg soil with an established
population of the three Bradyrhizobium elkanii strains 29w (SEMIA 5019):SEMIA 566 : SEMIA 587, 22%:36%:34%] which are established in most Brazilian soils cultivated with
soybean. Differences were verified among cultivars, with some accumulating up to twice as much nodule dry weight and N in
tissues as others. The variability among cultivars was also confirmed when six of them were used in a field experiment, resulting
in differences in nodulation, yield and total N accumulated in grains. The analysis of nodule occupancy in 12 cultivars grown
either under sterile conditions and receiving a double inoculum and N-free nutrient solution, or in pots containing soil with
an established population of bradyrhizobia, showed the preference of cultivars for specific strains.
Received: 7 December 1998 |
| |
Keywords: | Bradyrhizobium Glycine max Nodulation Symbiosis Plant breeding |
本文献已被 SpringerLink 等数据库收录! |
|