THE ECOLOGICAL IMPORTANCE OF SEED DIMORPHISM IN CORN SPURRY (SPERGULA ARVENSIS L.) II: THE EFFECTS OF NITRATE CONCENTRATIONS AND TEMPERATURE ON SEED GERMINATION

摘要

Spergula arvenis produces two types of seeds that differ in the absence (non papillate, NP) or presence (papillate, P) of papilla on the seed coat. Corn spurry inhabits cultivated soils and ruderal fields and usually encounters substantial variations in soil nutrients. The objective of this study was to determine the effects of nitrate concentrations and temperature (10-30 degrees C) on the germination of heteromorphic seeds.