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<p>In cauliflower, the ‘curd’ is the edible portion, which represents a highly proliferated prefloral apical meristem. The <i>Or</i> gene causes massive accumulation of β-carotene in the curd portion, resulting in an orange color to the curd. The <i>Or</i> gene also delays the onset of curd formation and reproductive transitions and causes severe curd deformity. Cytokinin play a key role in the proliferation of meristematic cells, but a lack of information hampers understanding of gene-associated deformities. The present study analyzed cytokinin in leaves of CF<sub>Or-HM</sub> (homozygous orange), CF<sub>Or-HT</sub> (heterozygous orange), and CF<sub>WT</sub> (white type) collected at four developmental stages: vegetative stage (VS), curd initiation (CI), full curd (FC), and bolting stage (BT). The experiment was done in a factorial randomized block design with three replications at ICAR-IARI, New Delhi. Cytokinin were analyzed by ultra-performance liquid chromatography-mass spectrometry (UPLC-MS). Significant differences were observed in CF<sub>Or-HM</sub> and white cauliflower, suggesting the impact of the <i>Or</i> gene. CF<sub>or-HM</sub> had 3.55% and 57.58% higher <i>trans</i>-zeatin and dihydrozeatin than CF<sub>WT</sub> in leaves. A strong correlation exists between trans-zeatin content in the curd portion and curd length (r = 0.98, p &lt; 0.05) and curd diameter (r = 0.99, p &lt; 0.05). The correlation among cytokinin, curd size and plant morphologies will aid in modulating the morphometrics of orange cauliflower.</p>

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Or Gene-Associated Changes in Endogenous Cytokinin Affect Curd Morphology and Developmental Processes in Cauliflower

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Anamika Chandel,
  • Shrawan Singh,
  • Shivani Nagar,
  • Aditi Kundu,
  • Sohamkumar Luhana,
  • Manisha Mangal

摘要

In cauliflower, the ‘curd’ is the edible portion, which represents a highly proliferated prefloral apical meristem. The Or gene causes massive accumulation of β-carotene in the curd portion, resulting in an orange color to the curd. The Or gene also delays the onset of curd formation and reproductive transitions and causes severe curd deformity. Cytokinin play a key role in the proliferation of meristematic cells, but a lack of information hampers understanding of gene-associated deformities. The present study analyzed cytokinin in leaves of CFOr-HM (homozygous orange), CFOr-HT (heterozygous orange), and CFWT (white type) collected at four developmental stages: vegetative stage (VS), curd initiation (CI), full curd (FC), and bolting stage (BT). The experiment was done in a factorial randomized block design with three replications at ICAR-IARI, New Delhi. Cytokinin were analyzed by ultra-performance liquid chromatography-mass spectrometry (UPLC-MS). Significant differences were observed in CFOr-HM and white cauliflower, suggesting the impact of the Or gene. CFor-HM had 3.55% and 57.58% higher trans-zeatin and dihydrozeatin than CFWT in leaves. A strong correlation exists between trans-zeatin content in the curd portion and curd length (r = 0.98, p < 0.05) and curd diameter (r = 0.99, p < 0.05). The correlation among cytokinin, curd size and plant morphologies will aid in modulating the morphometrics of orange cauliflower.