科研之友
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摘要
The aim of this study was to compare the growth of five cultivars of soybean produced in the State of Sao Paulo under conditions of flooding and evaluate the response of the plants to nitrate under such conditions. The study involved the analysis of leaf area, shoot dry mass, volume of the root system and root dry mass, using the soybean cultivars IAC Foscarin-31, IAC-23, IAC-17, IAC-24 and IAC-18, as well as a histological analysis of the stem and main root of the cultivar IAC-23, after being maintained for 28 days under flooding conditions. All cultivars were submitted to the following treatments: flooding of the root system without nitrate; flooding in the presence of nitrate; and flooding with nitrate added seven days after flooding. Our data indicate that the choice of cultivar and the use of nitrate should be taken into account for the planting of soybean in regions subject to flooding. The presence of nitrate during flooding was beneficial for all five cultivars tested. The cultivar IAC-24 presented the highest growth in the presence of nitrate. IAC Foscarin-31 was the most responsive cultivar to the addition of nitrate seven days after flooding, when considering plant growth. The presence of aerenchyma on the stem and main root of the flooded plants was observed for all treatments. However, variation occurred in the arrangement of parenchyma cells, this being more compact in the treatments with nitrate.
- 出版日期2013-3
