TY - JOUR AU - Adam, AMM Golam AU - Jahan , Nargis AU - Rashid, Parveen PY - 2022/02/10 Y2 - 2024/03/29 TI - Changes in Photosynthetic Pigment of Wheat(Triticum Aestivum L. Var. Bari Gom-25) As Affected By Naa and N-Fertilizer JF - Dhaka University Journal of Biological Sciences JA - Dhaka Univ. J. Biol. Sci VL - 31 IS - 1 SE - Articles DO - 10.3329/dujbs.v31i1.57925 UR - https://www.banglajol.info/index.php/DUJBS/article/view/57925 SP - 169-176 AB - <p>A field experiment was conducted to investigate the changes inphotosynthetic pigment of BARI Gom-25 as affected by foliar spray of NAA andN-fertilizers. The experiment consisted of seven different concentrations of NAA(NAA<sub>0</sub> = 0, NAA<sub>1</sub> = 10, NAA<sub>2</sub> = 20, NAA<sub>3</sub> = 30, NAA<sub>4</sub> = 40, NAA<sub>5</sub> = 50 and NAA<sub>6</sub> =60 ppm) and five N-levels (F<sub>0</sub>=0, F<sub>1</sub>=25, F<sub>2</sub>=50, F<sub>3</sub>=75 and F<sub>4</sub>=100% of therecommended dose) and their 35 combination treatments. Results revealed thatfoliar application of 40 ppm NAA (NAA<sub>4</sub>) produced higher chlorophyll a contentat all stages (tillering, flowering and grain filling) and were significantly higherthan control at tilling and flowering stages. Chlorophyll b and carotenoidcontents did not show any general trend to NAA at any stage except at tillingstage. Application of 50% of the recommended N-fertilizer (F<sub>2</sub>) producedsignificantly maximum photosynthetic pigment contents at tilling stage whereas,at flowering stage the same results were obtained from 100% of therecommended N-fertilizers (F<sub>4</sub>) but with few exceptions. At grain filling stage,photosynthetic pigment did not show any general trend to N-fertilizerapplication. Findings on combined effects indicated that 20 and 30 ppm NAA incombination with 50% N-fertilizer (NAA<sub>2</sub>F<sub>2</sub> and NAA<sub>3</sub>F<sub>2</sub>) had producedsignificantly maximum chlorophyll a content at tilling stage. However, atflowering stage the highest chlorophyll a content was noted from NAA<sub>2</sub>F<sub>4</sub>treatment (20 ppm NAA in combination with 100% N-fertilizer). Findings alsorevealed that combined application of NAA and N-fertilizer had not resulted anygeneral trend on chlorophyll b and carotenoid contents in most of the caseswhere the maximum value in photosynthetic pigment was found depending onthe concentrations of NAA, fertilizer dose and plant growth stages.</p><p>Dhaka Univ. J. Biol. Sci. <strong>31</strong>(1): 169-176, 2022 (January)</p> ER -