Auto-parasitization of leaves in pulses-N limiting or C limiting?

Abstract

Self-distruction of leaves in pulses d ring seed filling period has been suggested to supplement seed N level. This has implied to mean that pulses are inefficient in taking up N. The object of this paper is to enquire whether this inefficiency is based on some inherent inability or only an apparent phenomenon consequent of some other limitations. Our analysis suggests that lack of carbohydrate during seed filling period is a major limitation in the ability of pulses to ta^e up N when compared to cereals. This is further aggravated by the relatively poor "N-transtation capacity of the pulses. An increase in the net photosynthesis during seed filling period as a means to alleviate the stress of C-availability and hence N-uptake is suggested.