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Abstract
Two rice varieties, a land race (Piaui) and an improved variety (IAC-47), were cultivated in pots in a system that simulates the seasonal nitrate flushes in tropical soils. Piaui plants did accumulate more
in the shoots than IAC-47, especially in the sheaths. Piaui plants have also shown a low nitrate reductase activity (NRA) at the early stages of growth, what may be and advantage for the accumulation of
. Piaui plants showed a higher
content and a lower NRA in the flag leaves at anthesis, while IAC-47 on the contrary showed lower
content and higher NRA at anthesis. The data indicated that Piaui plants have apparently a higher N-use efficiency than IAC-47 plants do. This ability results in higher content of grain protein, even when growing in poor soils. These results suggest this to be related to a superior capacity of Piaui plants to take up
from low nutrient soils, and store it in the reserve pools during the early stages of growth and development.
Acknowledgments
The authors are grateful to the Mariam Lis Martinez Stark and Marco André Alves de Souza by the valuable collaboration in this work, also to Rodrigo Grazinoli Garrido for the last review. Financial support by FAPERJ and CNPq.