Abstract
Abstract Diurnal patterns of nitrate, potassium, and phosphate uptake by seedlings of five corn genotypes were compared. Whereas phosphate uptake showed little daily variation (<30% difference between minimal and maximal rates), both nitrate and potassium uptake varied more than two‐fold during a 24 h cycle. The data indicate that the uptake of phosphate is subject to metabolic controls separate from those affecting potassium and nitrate. The daily patterns of nitrate and potassium uptake differed between two single‐cross hybrids, but were not directly related to the patterns exhibited by their parental inbred lines. Maximal differences in nitrate and potassium uptake among genotypes were observed between 4 and 8 h after the start of the light period, and reflected genotypic differences in total nitrate and potassium uptake over the 24 h cycle. These results provide a basis for establishing an appropriate time interval for the screening of maize genotypes for nitrate uptake. A single‐plant evaluation conducted during the middle of the light period clearly revealed differences in nitrate uptake by the two hybrids with each exhibiting a wide range among individual plants.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
