The effect of daylength on the development of glasshouse celery

Roelofse, E. W.; Hand, David W.; Hall, Wendy

doi:10.1080/14620316.1989.11515956

Cited by 11 publications

(3 citation statements)

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“…In 2000, the main stem apex was dissected under a binocular microscope (magnification 40×) to determine the stage of early development of infl orescence, according to the scale previously defi ned by Roelofse et al (1989). The discrete developmental stages of celery infl orescence ranged from 0 (no evidence of infl orescence development) to 7 (complete transition from a vegetative meristem to an infl orescence) (Roelofse et al, 1989(Roelofse et al, , 1994. We considered stage 1 (initiation of infl orescence) of the main stem apex to be the microscopic criterion for celery fl oral induction.…”

Section: Research Reportsmentioning

confidence: 99%

“…As a result, the period between perception and the point when the stem is too long is critical for management decisions about time to harvest. The objective of this study was to determine whether celery infl orescence initiation observed either visually (Pressman and Sachs, 1985) or microscopically (Roelofse et al, 1989(Roelofse et al, , 1994) could be combined with growth data to determine the optimal time to harvest.…”

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confidence: 99%

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Early Field Detection of Bolting in Celery

Jenni¹,

Gamache²,

Côté³

et al. 2005

horttech

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Growers of early stalk celery (Apium graveolens var. dulce) often experience financial losses due to bolting (the premature and rapid elongation of the main celery stem) in temperate regions. A method was developed to provide early warning of bolting in field-grown celery, on the basis of two criteria, one visual and one microscopic, for inflorescence development. Bolting could be detected 40 days after transplanting using the visual criterion, and as early as 30 days after transplanting using the microscopic criterion. Early detection of bolting using the visual and microscopic criteria provided celery growers with periods of, respectively, 25 days and up to 35 days to consider harvesting earlier, before the length of the celery stems exceeded commercial standards. This method could be effective in minimizing financial losses due to bolting when coupled with agro-economic studies.

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Section: Research Reportsmentioning

confidence: 99%

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confidence: 99%

Early Field Detection of Bolting in Celery

Jenni¹,

Gamache²,

Côté³

et al. 2005

horttech

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“…Previous research reported that the overgrowth of seedlings in the early period of tomato growth could reduce the total output by more than 30% [1]. Thus, suppressing the overgrowth of seedlings is an important issue in the raising of vegetable seedlings, and several methods of adjusting the diurnal temperature [2], shortening the sunshine [3,4], or using brush and impedance have been well utilized [5,6]. Moreover, through chemical methods, plant growth retardants were proven to be the most effective way to inhibit overgrowth.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Transcriptome Reveals an Opposite Regulatory Effect of Plant Growth Retardants in Controlling Seedling Overgrowth between Roots and Shoots

Chen

Zheng

et al. 2019

IJMS

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Seedling overgrowth always develops in undernourished plants due to biotic or abiotic stresses, which significantly decrease the yield of crops and vegetables. It is known that the plant growth retardants paclobutrazol (PBZ) and chlormequat chloride (CCC) are the most commonly used chemicals in controlling seedling height in plants by regulating the gibberellin (GA) biosynthesis pathway. However, the exact molecular regulation mechanism remains largely unknown. This study performed a comprehensive transcriptome profile to identify significantly differentially expressed genes after adding CCC and PBZ to the water culture seedling raising system for the first time. According to the obviously restrained shoots and roots, the GA biosynthesis genes were significantly decreased, as well as the endogenous GA content being reduced. Intriguingly, the GA signaling pathway genes were affected in opposite ways, increasing in roots but decreasing in shoots, especially regarding the phytochrome interacting factor SlPIF1 and the downstream genes expansins (SlEXPs), which promote cell wall remodeling. Further study found that the most down-regulated genes SlEXPA5 and SlEXPA15 were expressed specifically in shoot tissue, performing the function of repressing elongation, while the up-regulated genes SlEXPB2 and SlEXPB8 were proven to be root-specific expressed genes, which may promote horizontal elongation in roots. This research reported the comprehensive transcriptome profiling of plant growth retardants in controlling seedling overgrowth and restraining GA biosynthesis through the regulation of the GA signaling-related genes SlPIF1 and SlEXPs, with an opposite expression pattern between roots and shoots.

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