Photosynthate Partitioning in Wheat (triticum Aestivum L.) as Affected by Root-zone Salinity and Form of N
Year: 2009
Type: article
Abstract: Carbon-14 pulse labeling technique was used to study the effect of rooting medium salinity and form and availability of N on growth and rhizodeposition of wheat (Triticum aestivum L.). Of the applied 14 C pulse, 83% was determined in plants, while 89% and 11% was determined in the shoot and root portions, respectively. Salinity showed a depressing effect on different plant parameters particularly on roots. However, NO3 - -fed plants showed better growth than NH4 + -fed plants at all the three salinity levels. Presence of NaCl in the rooting medium led to a decrease in the water content of both root and shoot portions. The proportion of assimilated 14 C released into the rooting medium as rhizodeposits varied between 1.5 and 3.2%, while 8-13% was unaccounted for and assumed to be respired. Rooting medium salinity led to higher rhizodeposition and lower loss of 14 C. Relatively higher proportion of 14 C was released as rhizodeposits and retained in root and shoot portions of plants fed with NH4 + or NH4 + + NO3 - than those with NO3 - while less was respired. The specific activity of the rhizodeposits was also higher under saline conditions. The rhizodeposits in NH4 + -fed plants were more highly labeled as compared to NO3 - -fed plants.
Source: Pakistan Journal of Botany
Authors: A. Lodhi, Muhammad Sajjad, Ansar Mahmood, Shermeen Tahir, Farooq-e-Azam
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W2138483740