Abstract
The present study was carried out to evaluate the response of different bioagents/biofungicides and growth regulators on seed germination and early seedling growth of sunflower. Eleven (11) treatments were established for the present investigation. Higher germination was observed in T5, T6/T7, T10 and T11 treatments in contrast to other treatments. Treatments T7, T3 and T11 were found significantly better than all other treatments. Generally, root and shoot length increased with the advancement of growth stages. T4 showed higher number of secondary roots in comparison to all other treatments. The shoot length and root length in all the cases (irrespective of the cultivars: DRSH-1, DRSF-108, LSFH-171) were highly influenced by the bioinoculants and chemicals; however, influence of bioagents was found better than the chemicals. Similarly, the seedling weight in 96 hours after sowing and 144 hours after sowing in all the cultivars was reported higher than when the seeds were treated with bioinoculants, which reflected the efficacy of the bioinoculants compared to others.
Highlights
An experiment was carried out to evaluate the response of different bioinoculants and growth regulators on seed germination and early seedling growth of sunflower
The results indicated that the growth of Trichoderma viride, Trichoderma harzianum, Pseudomonas fluorescens or their combination treated sunflower seedlings excelled over the untreated ones
The results indicate that the bioagents like T. viride, T. harzianum and P. fluorescens have similar type of influence on seed germination like growth regulator and chemicals
Summary
An experiment was carried out to evaluate the response of different bioinoculants and growth regulators on seed germination and early seedling growth of sunflower. Gibberellic acid (GA3) and 1-Naphthalene Acetic Acid (NAA) were used as growth regulators; whereas Trichoderma viride, Pseudomonas fluorescens and Trichoderma harzianum biofungicides were used as bioinoculants. Higher values of shoot and root lengths and fresh and dry weights of sunflower were recorded when the seeds were treated. Pseudomonas fluorescens treated seeds (T4) showed higher number of secondary roots in comparison to all other treatments. The overall results indicate that the growth of bioagent treated sunflower seedlings excelled over the untreated seedlings in terms of growth. All the bioagents either in combination or individually proved to be a boosters as biofertilizers/bio-stimulants, and are reported at par with the growth regulators in relation to seed germination and early seedling growth
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