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Effects of Photoperiod on Growth and Development of Soybean Floral Bud in Different Maturity

Effects of Photoperiod on Growth and Development of Soybean Floral Bud in Different Maturity,10.2134/agronj2001.934944x,Agronomy Journal,Lingxiao Zhan

Effects of Photoperiod on Growth and Development of Soybean Floral Bud in Different Maturity   (Citations: 10)
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croscopic dissection (Evans, 1969). However, the effect of photoperiod on soybean floral bud growth, as a sole Growth and development of most soybean (Glycine max (L.) event, is less discussed. Some efforts have been made Merr.) plants is sensitive to photoperiod effects. Therefore, it is impor- tant to understand and quantify the processes involved. Studies were to understand and quantify the thermal-photoperiod conducted to determine growing degree days required for growth of requirement for the rates of floral bud growth of differ- the floral bud from initiation to open flower of different maturity ent soybean MGs (Ephrath and Hesketh, 1991; Zhang groups (MGs) in both field and controlled environments. Eighteen et al., 1993, 1995). The objective of this experiment was soybean strains, including 'Clark' back-cross near-isolines differing in to further understand the thermal-photoperiod require- maturity, were sown in the field at five different dates in 1992 and ments of soybean cultivars with different MGs so that 1993. In growth chamber studies, plants of two strains differing in more information can be used for predicting phenology maturity were used and moved to 12-, 14-, and 16-h daylengths after and culture management to properly apply optimal cul- floral buds were initiated in 12 h. Results from both field and growth tural practices. chamber studies indicated that planting dates had a significant effect on the thermal requirement for bud growth in the late-maturing strains used. Shorter photoperiods during the bud growth period accelerated growth rates to open flower. Furthermore, in the growth chamber
Journal: Agronomy Journal - AGRON J , vol. 93, no. 4, 2001
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