Effect of light and gibberellic acid on photosynthesis during leaf senescence of alstroemeria cut flowers.

Seed germination of wild buckwheat (Polygonum convolvulus L.) and cow cockle (Saponaria vaccaria L.) increased with increasing time of immersion in 6% sodium hypochlorite (NaOCl). Maximum germination was obtained at 6 to 8 h for wild buckwheat and at 2 h for cow cockle. The effect of NaOCl treatment of wild buckwheat seeds mimics the effect of acid scarification. Wild buckwheat germination was not influenced by light and (or) gibberellic acid (GA3). To induce 50% germination (t½) of cow cockle NaOCl treatments of 0.5 and 1 h were required for seeds incubating in the dark and light, respectively. Once the seed coat was made more permeable by NaOCl, both the promoting effect of GA3 and the inhibitory effect of light were increased. When the optimum effect of NaOCl occurred, all the seeds germinated. However, prolonged NaOCl treatment resulted in either poor germination or seed disintegration.The hard coat seems to be the main factor in regulating wild buckwheat seed germination. Cow cockle, however, is regulated by at least two other factors, light and hormones, in addition to seed coat.

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Effect of light, gibberellic acid and abscisic acid on germination of guayule (Parthenium argentatum Gray) seed

Industrial Crops and Products ◽

10.1016/j.indcrop.2010.03.012 ◽

2010 ◽

Vol 32 (2) ◽

pp. 111-117 ◽

Cited By ~ 15

Author(s):

P. Dissanayake ◽

D.L. George ◽

M.L. Gupta

Keyword(s):

Abscisic Acid ◽

Gibberellic Acid ◽

Parthenium Argentatum ◽

Effect Of Light

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Interrelations between Gibberellic Acid, Cytokinins and Abscisic Acid in Retarding Leaf Senescence

Physiologia Plantarum ◽

10.1111/j.1399-3054.1971.tb06720.x ◽

1971 ◽

Vol 24 (1) ◽

pp. 76-79 ◽

Cited By ~ 30

Author(s):

A. BACK ◽

AMOS E. RICHMOND

Keyword(s):

Abscisic Acid ◽

Gibberellic Acid ◽

Leaf Senescence

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PHYSIOLOGICAL CHANGES ASSOCIATED WITH LEAF SENESCENCE IN EASTER LILIES

HortScience ◽

10.21273/hortsci.30.2.189a ◽

1995 ◽

Vol 30 (2) ◽

pp. 189a-189

Author(s):

Rosanne E. Franco ◽

Susan S. Han

Keyword(s):

Gibberellic Acid ◽

Leaf Senescence ◽

Growth Regulators ◽

Cold Storage ◽

Foliar Application ◽

Lilium Longiflorum ◽

Continuous Treatment ◽

Physiological Effects ◽

Easter Lily ◽

The Individual

Senescence of lower leaves of Easter lilies (Lilium longiflorum Thunb.) was previously shown to be delayed with application of the growth regulators, gibberellic acid (GA3) and benzyladenine (BA). This study was done to determine the physiological effects of GA3 and BA in relation to the delay of leaf senescence. Foliar application with 500 ppm BA or GA3 delayed chlorosis and lowered respiration rate in Easter lily leaves. A combination of 500 ppm BA and 500 ppm GA3 was more effective than the individual application of each. Gibberellic acid, BA, or their combination before cold storage resulted in delayed chlorosis and lowered respiration following removal from cold storage. Treatment with growth regulators after cold storage was less effective. Senescence of leaves was not associated with ethylene since ethylene production by leaves was undetectable by gas chromatograph. In addition, pulsing or continuous treatment with silver thiosulphate (STS), an inhibitor of ethylene synthesis, did not delay foliar chlorosis. Analysis of carbohydrate levels in Easter lily leaves treated with GA3, BA, or their combination may contribute to the understanding of the physiological effects of these two growth regulators.

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Zantedeschia aethiopica and Z. `Green Goddess' Responses to GA3 and Bonzi for Cut Flower Calla Lily Production in Florida

HortScience ◽

10.21273/hortsci.33.3.536f ◽

1998 ◽

Vol 33 (3) ◽

pp. 536f-537

Author(s):

Ramona A. Reiser

Keyword(s):

Gibberellic Acid ◽

Flower Development ◽

Cut Flower ◽

Cut Flowers ◽

Large White ◽

Flower Production ◽

Zantedeschia Aethiopica ◽

Calla Lily ◽

Growing Conditions ◽

Unique Green

Zantedeschia aethiopica, the large white calla lily, and Z. `Green Goddess', which is white with a unique green blush on the lip, are two cultivars popular in the floral cut flower trade. Both were treated with gibberellic acid (GA3) for increased flower development, a technique routinely successful for potted calla production but not previously reported effective on cut flowers. Two winter trials in successive years were replicated under Florida growing conditions. A preplant bulb dip of GA3 ranged from 100 to 250 ppm. Z. aethiopica control plants averaged 1.3 flowers per plant, which increased to 3.4 with GA3 in the first trial and from 1.6 to 2.5 in the second trial. `Green Goddess' went from 1.3 to 3.8 flowers per plant and 0.9 to 3.3, respectively. Bonzi was applied at either a short (10.2–12.7 cm) or tall (30.5–38.1 cm) height, with greater effect when shorter. A drench application of 2 mg a.i. per pot shortened foliage more than flower height with 32% reduction on foliage and 12% on flowers for Z. aethiopica and 44% and 33% respectively on `Green Goddess'. Results favor use of GA3 on cut flowers for increased flower production, but discourage Bonzi because shortened heights are normally undesirable for cut flowers.

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Morphology and responses of Tulipa gesneriana L. to light quality in combination with GA and cold storage time

Indian Journal of Agricultural Research ◽

10.18805/ijare.a-280 ◽

2017 ◽

Vol 51 (06) ◽

Author(s):

Akram Amiri ◽

Mohsen Kafi ◽

Sepideh Kalate -Jari ◽

Mohammad Matinizadeh

Keyword(s):

Gibberellic Acid ◽

Cold Storage ◽

Present Experiment ◽

Storage Time ◽

Light Quality ◽

Growth Parameters ◽

Dry Weight ◽

Light Sources ◽

Cut Flowers ◽

Tulipa Gesneriana

Tulips are one of the important bulbous flowers and valuable as cut flowers. Hence, the present experiment was conducted in order to study effect of different concentrations of gibberellic acid (GA), light sources, and cold storage time on tulip flowers. The results of the present study revealed that day to sprouting and flowering of tulip decreased by T1×G2B, and T1×G2B and T2×G2B conditions, respectively. Plant height as well as the first internode length was also increased at T1×CD and T2×CD conditions. Furthermore, all light treatments, except of the dark conditions, enhanced the amount of anthocyanin and chlorophyll content of tulips plants. Similarly, the same trend recorded for dry weight of leaf and bulb of tulip. In conclusion, application of different light qualities in combination with GA and cold storage treatments resulted in an improvement in the growth parameters as well as the morphological and the flowering characteristics of tulip.

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