Alleviation of seeding chlorosis by plant growth regulators in drip-irrigated rice. (17th February 2017)

• Record Type: Journal Article
• Authors: Zhang, Jun; Zhang, Shujie; Chen, Lin; Wei, Changzhou
• Is Part Of: Acta agriculturæ Scandinavica. Volume 67:Number 2(2017)
• Page Start: 184
• Page End: 190
• Publication Date: 2017-02-17
• Subjects: Drip-irrigated rice -- plant growth regulator -- iron chlorosis -- leaf active Fe2+ -- yield; Horticulture -- Periodicals; Soil science -- Periodicals; Crops and soils -- Periodicals; Plant-soil relationships -- Periodicals; 630
• DOI: 10.1080/09064710.2016.1240828
• Languages: English
• ISSNs: 0906-4710

Abstract

ABSTRACT: Drip irrigation can produce high rice yields with significant water savings; therefore, it extends rapidly in water-scarce northern China. However, drip-irrigated rice seedlings often exhibit Fe chlorosis. The objective of this field experiment was thus to determine the ability of plant growth regulators to alleviate chlorosis in drip-irrigated rice seedlings. The study compared three plant growth regulators (1-naphthylacetic acid, NAA; sodium nitrophenolate, CSN; and diethyl aminoethyl hexanoate, DA-6) applied in two ways (seed-soaking and drip-application). The results showed that CSN increased root oxidation activity by 37% in the seed-soaking treatment and by 45% in the soil-application treatment. Seed soaking with NAA, CSN, and DA-6 increased the active Fe content in leaves by 8.8%, 17.5%, and 11.4%, respectively, compared with untreated seedlings. Iron absorption and SPAD values were both greater in the soil-application plots than in the seed-soaking plots. Among the plant growth regulators, CSN resulted in the highest yield (2.2% greater than untreated rice in the seed-soaking treatment and 12.8% greater than untreated rice in the soil-application treatment). In conclusion, CSN significantly improved root Fe uptake at the seedling stage and reduced chlorosis in drip-irrigated rice. Therefore, CSN drip application can be recommended for alleviating rice chlorosis in practical use.