Utilization of Previously Accumulated and Concurrently Absorbed Nitrogen during Reproductive Growth in Maize 1: Influence of Prolificacy and Nitrogen Source
AUTOR(ES)
Pan, William L.
RESUMO
A prolific maize (Zea mays L.) genotype was grown to physiological maturity under greenhouse conditions to examine the effects of reproductive sink demand on (a) the remobilization of N accumulated during vegetative growth, and (b) the partitioning of N accumulated concurrent with ear development. One- and two-eared plants were treated with either a NO3− or NH4+ source of 15N-labeled N during reproductive growth. Plants with two ears enhanced grain production, N remobilization from the stalk and roots, and N translocation to the grain from concurrently assimilated N. But, remobilization of leaf-N was unaffected by ear number. In addition, N uptake and total dry matter accumulation during the reproductive period were also unaffected, although P uptake was greater in the two-eared plants. Less than 15% of the total K+ uptake was accumulated after silking while during this time more than 40% of the total N and more than 50% of the total P were absorbed. The data also indicate that with NO3− nutrition, internal recirculation of K+ between shoots and roots may play a prominent role in the transport of nitrogenous solutes during grain development. N source had no effect on dry matter production and N uptake of both one- and two-eared plants. However, slightly greater partitioning of labeled-N from the NH4+ source to the grain was observed in the two-eared plants.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1056098Documentos Relacionados
- Utilization of Ammonium as a Nitrogen Source 1: Effects of Ambient Acidity on Growth and Nitrogen Accumulation by Soybean
- Water Transfer in an Alfalfa/Maize Association 1: Survival of Maize during Drought
- Influence of the nitrogen source on Saccharomyces cerevisiae anaerobic growth and product formation.
- Oligopeptides are the main source of nitrogen for Lactococcus lactis during growth in milk.
- Influence of Carbohydrate and Nitrogen Source on Patulin Production by Penicillium patulum1