Studies in sorghum—The non-auriculate and e-ligulate condition

Ayyangar, G. N. Rangaswami; Rao, V. Panduranga; Ponnaiya, B. W. X.

doi:10.1007/bf03051201

Cited by 3 publications

(1 citation statement)

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“…Under our conditions an individual panicle requires 4-12 days for all spikelets to flower. Flowering proceeds basipetally on a panicle as glumes of spikelets in a horizontal plane open at about the same time (Ayyangar and Rao 1931;Stephens and Quinby 1934). On any day of the flowering period a panicle may have an upper region of spikelets with dried anthers that have dehisced pollen, a middle region of spikelets with yellow anthers shedding fresh pollen, and a basal portion of immature florets (Pendleton et al 1994).…”

Section: Existing Problems and Further Research Needsmentioning

confidence: 99%

On the relation between weather variables and sorghum ergot infection

Wang¹,

Meinke²,

Ryley³

et al. 2000

Aust. J. Agric. Res.

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Sorghum ergot (Claviceps africana) has had a significant impact on seed production and breeders’ nurseries in Australia since it was first found in 1996. In this paper, 3 distinct key development stages of sorghum that are related to ergot infection were identified: flag leaf stage, pollen starch accumulation stage, and flowering period. Relationships between weather variables during these 3 stages and ergot severity as well as pollen viability were analysed using observed data from 2 field trials, a serial planting trial and a genotype trial, conducted at Gatton, Queensland. The duration of the flag leaf stage and of the flowering period was estimated from thermal time. An infection factor was introduced and calculated based on hourly temperature during the flowering period. This infection factor and the mean relative humidity at 0900 hours during the flowering period were the main factors influencing ergot infection. Mean daily minimum temperature during flag leaf stage also had a significant effect on ergot severity, although no significant relation was found between this mean daily minimum temperature and pollen viability. A linear regression model using the above 3 factors accounted for 94% of the environmentally caused variation in ergot severity observed in the genotype trial.

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Section: Existing Problems and Further Research Needsmentioning

confidence: 99%