The effect of Bacillus subtilis FZB24®
on saffron (Crocus sativus L.) was studied
using saffron corms from Spain and the powdered form of B. subtilis FZB24®
. Corms were
soaked in water or in B. subtilis FZB24 spore solution for 15min before sowing. Some corms
were further soil drenched with the spore solution 6, 10 or 14 wks after sowing. Growth and
saffron stigma chemical composition were measured. Compared to untreated controls,
application of B. subtilis FZB24 significantly increased leaf length, flowers per corm, weight
of the first flower stigma, total stigma biomass; microbe addition also significantly decreased
the time required for corms to sprout and the number of shoot sprouts. Compared to the
controls picrocrocin, crocetin and safranal compounds were significantly increased when the
plants were soil drenched with the spore solution 14 weeks after sowing; in contrast crocin
was highest in untreated controls. Results of this study suggest that application of B. subtilis
FZB24® may provide some benefit to saffron growers by speeding corm growth (earlier shoot
emergence) and increasing stigma biomass yield by 12%. While some treatment conditions
also increased saffron chemical composition, these were generally not the same treatments
that simultaneously improved growth yields and thus, more study is required.
The effect of Bacillus subtilis FZB24® on saffron (Crocus sativus L.) was studiedusing saffron corms from Spain and the powdered form of B. subtilis FZB24®. Corms weresoaked in water or in B. subtilis FZB24 spore solution for 15min before sowing. Some cormswere further soil drenched with the spore solution 6, 10 or 14 wks after sowing. Growth andsaffron stigma chemical composition were measured. Compared to untreated controls,application of B. subtilis FZB24 significantly increased leaf length, flowers per corm, weightof the first flower stigma, total stigma biomass; microbe addition also significantly decreasedthe time required for corms to sprout and the number of shoot sprouts. Compared to thecontrols picrocrocin, crocetin and safranal compounds were significantly increased when theplants were soil drenched with the spore solution 14 weeks after sowing; in contrast crocinwas highest in untreated controls. Results of this study suggest that application of B. subtilisFZB24® may provide some benefit to saffron growers by speeding corm growth (earlier shootemergence) and increasing stigma biomass yield by 12%. While some treatment conditionsalso increased saffron chemical composition, these were generally not the same treatmentsthat simultaneously improved growth yields and thus, more study is required.
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