Effects of water stress on anthesis and flower abscission in the glasshouse sweet pepper Capsicum annuum L.

Hawa Z.J., . (2003) Effects of water stress on anthesis and flower abscission in the glasshouse sweet pepper Capsicum annuum L. [Proceedings Paper]

Generally water deficit occurring at the reproductive stage is potentially most damaging to yields. In anticipation of the frequent drought incidences resulted from reduce precipitation due to local weather variability and impact from global climate change a series of experiments were conducted to investigate the impact of water stress on growth and development of glasshouse sweet paper when imposed at different intensity duration and stages of growth. This paper investigates and discusses the extent to which the imposition of water stress enhances reproductive development of Capsicum annuum L. in particular the anthesis. It also examines the possible role of leaf water potentials in development of the reproductive structures particularly in flower abscission. Mean radiation of 9.1 MJ m-2 d-1 and mean daily temperature of 27 deg C allowed normal development of both the primary and secondary flowers of Capsicum annuum L. under glasshouse. The development of the primary flowers was significantly accelerated when increasingly severe water stress water was imposed at the appearance of the first flower bud. This effect was also dependent upon the duration of stress. Prolonged severe stress clearly enhanced anthesis in teh primary but not in secondary flowers. The initial acceleration of the reproductive development induced by severe water stress did not continue after anthesis due to early onset of extensive flower abscission. The severity of abscission consistently followed the stress harshness order i.e. SS HS MS NS with almost complete abscission 97 occuring under SS condition. During the period of progressive water stress leaf water potentials ps liter declined with duration of stress from -0.43 MPa at the start of treatment to -1.63 MPa at 42 days after treatment compared to the ps liter in the NS treatment which recorded respective values of -0.11 to - 0.53 MPa. Anthesis seemed to occur at ps liter continuing stress and further declining the ps liter to about MPa seemed to induce abscission of the opened flowers. Wilting of leaves and almost complete abscission of primary flowers occurred when the ps liter reach values between -1.44 and 1.63 MPa. Although ps liter declined with severity and prolonging of stress duration the ps liter did not correlate well with the incidences of anthesis and flower abscission implying that there could be other underlying factors enhancing anthesis and inducing flower abscission during proressive stress.

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Abstract

Generally water deficit occurring at the reproductive stage is potentially most damaging to yields. In anticipation of the frequent drought incidences resulted from reduce precipitation due to local weather variability and impact from global climate change a series of experiments were conducted to investigate the impact of water stress on growth and development of glasshouse sweet paper when imposed at different intensity duration and stages of growth. This paper investigates and discusses the extent to which the imposition of water stress enhances reproductive development of Capsicum annuum L. in particular the anthesis. It also examines the possible role of leaf water potentials in development of the reproductive structures particularly in flower abscission. Mean radiation of 9.1 MJ m-2 d-1 and mean daily temperature of 27 deg C allowed normal development of both the primary and secondary flowers of Capsicum annuum L. under glasshouse. The development of the primary flowers was significantly accelerated when increasingly severe water stress water was imposed at the appearance of the first flower bud. This effect was also dependent upon the duration of stress. Prolonged severe stress clearly enhanced anthesis in teh primary but not in secondary flowers. The initial acceleration of the reproductive development induced by severe water stress did not continue after anthesis due to early onset of extensive flower abscission. The severity of abscission consistently followed the stress harshness order i.e. SS HS MS NS with almost complete abscission 97 occuring under SS condition. During the period of progressive water stress leaf water potentials ps liter declined with duration of stress from -0.43 MPa at the start of treatment to -1.63 MPa at 42 days after treatment compared to the ps liter in the NS treatment which recorded respective values of -0.11 to - 0.53 MPa. Anthesis seemed to occur at ps liter continuing stress and further declining the ps liter to about MPa seemed to induce abscission of the opened flowers. Wilting of leaves and almost complete abscission of primary flowers occurred when the ps liter reach values between -1.44 and 1.63 MPa. Although ps liter declined with severity and prolonging of stress duration the ps liter did not correlate well with the incidences of anthesis and flower abscission implying that there could be other underlying factors enhancing anthesis and inducing flower abscission during proressive stress.

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Item Type:	Proceedings Paper
Additional Information:	Received on 3 Dec 2007 QK710.2 M239 2003
AGROVOC Term:	GREENHOUSES
AGROVOC Term:	CAPSICUM ANNUUM
AGROVOC Term:	ABSCISSION
AGROVOC Term:	FLOWERS
AGROVOC Term:	DROUGHT STRESS
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:28
URI:	http://webagris.upm.edu.my/id/eprint/16963

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