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Effects of foliar application of BAP on source and sink strength in four six-rowed barley (Hordeum vulgare L.) cultivars

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An Erratum to this article was published on 22 February 2008

Abstract

A field experiment was conducted to investigate the effects of foliar application of a synthetic cytokinin (BAP) on source and sink strength of four different six-rowed barley (Hordeum vulgare L.) cultivars. Different spraying treatments consisting of spraying on whole plant, spraying only on leaves and spraying only on ears started at anthesis and continued for 7 days. One additional spraying was carried out on late period of grain filling. Results showed that spraying only on leaves did not affect ear weight, grain yield and 1,000-grain weight, while the two other treatments increased all above mentioned traits. Neither of treatments affected stem weight, biological yield and contribution of stem reserves in grain filling. Exogenous cytokinin did not increase photosynthetic rate and chlorophyll content in treated leaves until late period of grain filling, although there was no significant increase in final grain weight due to late application of BAP. Our results suggested that effects of foliar application of BAP were mostly due to increased sink size soon after anthesis and increased sink demand probably met by current photosynthesis of organs other than leaves, like ear green tissues.

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Abbreviations

BAP:

6-Benzyl aminopurine

DAA:

Days after Anthesis

Pn:

Photosynthetic rate

SMW:

Stem maximum weight

WSC:

Water soluble carbohydrates

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Authors and Affiliations

  1. Department of Agronomy and Plant Breeding, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran

    Shahab Maddah Hosseini, Kazem Poustini & Ali Ahmadi

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  1. Shahab Maddah Hosseini
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  2. Kazem Poustini
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  3. Ali Ahmadi
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Correspondence to Shahab Maddah Hosseini.

Additional information

An erratum to this article is available at http://dx.doi.org/10.1007/s10725-008-9261-z.

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Maddah Hosseini, S., Poustini, K. & Ahmadi, A. Effects of foliar application of BAP on source and sink strength in four six-rowed barley (Hordeum vulgare L.) cultivars. Plant Growth Regul 54, 231–239 (2008). https://doi.org/10.1007/s10725-007-9245-4

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