Studies on the Effect of Plant Growth Regulators on Growth, Flowering and Xanthophyll Content of African Marigold (Tagetes erecta L.)

Abstract

Production of marigold can be improved to a large extent by the judicious cultural operations i.e. application of optimum fertilizer at required time, crop management practices and use of plant growth regulators. Hence, an experiment was carried out in the Research Farm of Adhiparasakthi Horticultural College, Kalavai, during 2018-19 to find out the effect of plant growth regulators (NAA, GA 3 ) and growth retardants (Maleic hydrazide, Alar) on growth and yield of African marigold var. Pusa Narangi Gainda. The experiment was conducted in randomized block design with three replications. Biometric observations on plant height, number of branches, number of leaves, leaf area, days to first flowering, flower head diameter, single flower weight, number of flowers per plant, flower yield per plant and Xanthophyll content were recorded at 90 days after planting and statistically analyzed. Results of the experiment revealed that among the growth hormones tested, considering the flower yield per plant, the treatment with NAA @ 150 ppm recorded for the maximum number of flowers with increased flower weight resulted in maximizing the flower yield (447.2 g plant -1 ) with xanthophyll content (18.80 kg -1 of petal meal (g)).

Impact of Integrated Zinc and Iron Management Practices on Biochemical Attributes and Nutrient Uptake of Marigold cv. Local Orange

“…The findings of this study also demonstrated that the addition of Zn and Fe improved plant physiological parameter i.e total chlorophyll content in leaf. Similar results found by earlier workers [6,7,8] and [9].…”

Effect of Micronutrients on Flowering and Yield Attributes of Chrysanthemum (Dendrathemum grandiflora Tzeuleu) cv.CO 1

“…"The increase in flowering attributes may be due to the beneficial role of micronutrients in enhancing the translocation of carbohydrates, minerals and amino acids from the site of the synthesis to the storage tissue especially on flowers" as reported by Sha and Karuppaiah [2] in chilli, Patil et al [3] in sunflower, Balakrishnan et al [4] in African marigold and Naveen kumar et al [5] in chrysanthemum. Thirumalmurugan et al [6] also reported that a significant increase in the maximum number of flowers was noticed under the treatment (Zinc @ 0.5% + Boron @ 0.5%). The maximum flower diameter was increased with Recommended Dose of Fertilizer +Zn+Mn+B Fe, soil application + Zn EDTA +Mn EDTA + B +Fe EDTA (@ 0.4% each as foliar application) in leaves Swetha et al [7] in gaillardia.…”

Influence of Plant Growth Regulators on Growth, Yield and Yield Components in Garden Pea

“…Similarly, NAA enhance the cell elongation and division by promoting the DNA synthesis in the cell. It reduced the juvenile phase due to increase in Influence of Plant Growth Regulators on Growth, Yield and Yield Components in Garden Pea photosynthesis and respiration with enhanced CO 2 fixation in the plant (Murugan et al, 2020). The another plant growth regulator is salicylic acid (SA) which is considered as a phenolic antioxidant compound, messenger, or signaling molecule and growth regulator which support the plant growth and performance under different stressors.…”