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Rates of Net Carbon Dioxide Assimilation in Rice as Influenced by Growth Temperature and Photoperiod 1
Author(s) -
Azmi A. R.,
Ormrod D. P.
Publication year - 1971
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1971.00021962006300040009x
Subject(s) - photoperiodism , assimilation (phonology) , carbon dioxide , zoology , cultivar , horticulture , agronomy , carbon assimilation , growth rate , biology , photosynthesis , botany , mathematics , ecology , linguistics , philosophy , geometry
Plants of ‘Bluebonnet,’ ‘Caloro,’ ‘Dokri,’ and ‘Kangni’ cultivars were grown for 2, 4, 6 and 8 weeks in growth cabinets using temperatures of 35/18, 35/26.5, 35/35 and 40.5/18 C day/night and photoperiods of 8, 10, 12 and 14 hours. The rate of net CO 2 assimilation on a leaf blade weight basis was highest at 2 weeks in all varieties at all temperatures and photoperiods and declined with age. The greatest decline at 8 weeks compared to 2 weeks was 71% in Dokri and least was 65% in Bluebonnet. The assimilation rate was consistently higher in plants grown in 8‐hour photoperiod. Compared to 14‐hour, the rate at 8‐hour was higher by 28 and 25% at 6 and 8 weeks, respectively. In most cases, the highest assimilation rates were recorded at 40.5/18 and 35/35 C. Both Bluebonnet and Caloro had higher assimilation rates than Dokri and Kangni.