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CROP PHYSIOLOGY & METABOLISM

Influence of Nitrogen Availability on Seed Nitrogen Accumulation in Pea

^a Laboratoire d'Agronomie, INRA INAP-G, F-78850 Thiverval-Grignon, France

munierjo{at}dijon.inra.fr

The final seed nitrogen concentration (the ratio of seed N and dry matter content) is highly variable in pea (Pisum sativum L.) and N remobilization during seed filling may limit yield by restricting the seed filling period. This study was conducted to determine how seed N accumulation is regulated in pea. The effect of N availability and distribution on individual seed N accumulation rate at different nodes was investigated in three genotypes grown in the field and glasshouse under various levels of N fertilizer, depodding, and defoliation. The N content of vegetative plants parts (stems, leaves, podwalls) and seeds from three mainstem nodes were regularly recorded. Plant N available to the seeds at a given time was assessed as the sum of the amount of N still available for remobilization in vegetative parts and the amount of N accumulated by the plant. The results indicate that the N available in a plant at a given time can be considered as one common pool accessible to all seeds and equitably divided among them. Thus, the rate of individual seed N accumulation was unaffected by intra-plant position of seeds. This rate increased with the amount of N available per seed until a maximum rate of individual seed N accumulation (43 µg seed^-1 degree-day^-1) was reached. The relationship established between the rate of individual seed N accumulation and the plant N available per seed will be useful to improve models simulating yield and final seed N concentration in legumes.

Abbreviations: BSL, beginning of seed filling at the last reproductive node • DW, dry weight • NA, amount of nitrogen available to seeds • NAS, nitrogen available per seed • Nremob • amount of remobilizable nitrogen • Nveg, nitrogen content in vegetative parts • SNR, individual seed nitrogen accumulation rate

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