Planting models and mulching material strategies to reduce bundle sheath cell leakage and improve photosynthetic capacit
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RESEARCH ARTICLE
Planting models and mulching material strategies to reduce bundle sheath cell leakage and improve photosynthetic capacity and maize production in semi-arid climate Lixin Fu 1 & Honglei Ren 1 & Shengjun Xu 2 & Shaoxin Hu 1 & Jianfei Yang 1 & Chang Liu 1 Received: 11 May 2020 / Accepted: 23 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Better understanding of soil water storage and photosynthetic regulation of maize production will be useful to develop a watersaving strategy in rain-fed conditions. Therefore, maize crop was grown under the different cultivation practices for analyzed light and CO2-response curves under various mulching strategies during 2017–2018 years. Six different treatments were used such as the following: PP, ridges and furrows zone covered with plastic film mulching; PS, ridges covered with plastic film and furrows zone with stalk mulching; PN, ridges covered with plastic film and furrows zone without mulching; TP, conventional flat planting with plastic film mulching; TS, conventional flat planting with stalk mulching; and TN, conventional flat planting without mulching. The PP treatment had considerable effects on rainwater collection, improved SWS, and maize productivity than that of TP treatment. Significantly increase of SWS was observed under the PP treatment as a result photosynthetic capacity (An) improved under light and CO2-response curves, apparent quantum efficiency (α), respiration rate, total chlorophyll ab content, and 13C-photosynthates distribution in different organs. Under the PP and TP treatments, the maize might keep a great photosynthetic capacity at the post-flowering stage through improving An, LAI, soluble protein, Rubisco contents, and grain yield. The CO2 and light-response curves were significantly enhanced at the PP treatment due to higher 13C carbon isotope (Δ‰) and Ci/Ca as a result lower bundle sheath to leakiness of CO2 (ɸ) compared with the rest of all treatments. The results suggested that PP cultivation practice was the best water-saving strategy because it reduced bundle sheath leakiness to CO2 (ɸ); as a result there’s a significant improvement in soil water storage, LAI, 13C-photosynthates distribution, photosynthetic capacity parameters, and maize production. Keywords Cultivation practices . Mulching materials . Photosynthesis . 13C carbon isotope . CO2 cell leakage of bundle sheath . Biomass yield
Introduction Shortage of soil water storage in semi-arid regions is a big restraint for crops’ productivity, and with changing of climate, its influences will be more important in the near future (Jensen Responsible Editor: Philippe Garrigues Lixin Fu, Honglei Ren and Shengjun Xu have contributed equally to this work. * Lixin Fu [email protected] 1
Institute of Maize Research, Heilongjiang Academy of Agriculture Sciences, Harbin 150086, China
2
Gansu Academy of Agricultural Sciences, Lanzhou 730070, China
et al. 2010). To handle the water shortage in semi-arid regions, it is essential to improve water-sa
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