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Warming and water deficit impact leaf photosynthesis and decrease forage quality and digestibility of a C4 tropical grass.

Abstract：

:Global warming is predicted to cause more intense extreme events such as heat waves, flooding and severe droughts, producing significant effects on agriculture. In tropics, climate change will severely impact livestock production affecting water availability, forage quality and food for cattle. We investigated the isolated and combined effects of soil water deficit (wS) and + 2°C increase in canopy temperature (eT) on leaf gas exchange, chlorophyll fluorescence, carbohydrate content, forage quality and in vitro dry matter digestibility (IVDMD) of a field-grown C4 tropical forage grass Panicum maximum Jacq. using a temperature-free air-controlled enhancement (T-FACE) system. The wS and eT treatments showed no effects on photosystem II photochemistry. However, wS under ambient temperature decreased net photosynthesis rate (A), stomatal conductance (gs ) and maximum rate of carboxylation of Rubisco (Vcmax ), leading to a reduced starch content in leaves. A 16% reduction in leaf dry mass (LDM) and reduction in forage quality by increasing fibers, reducing crude protein (CP) and decreasing the IVDMD was also observed by effect of wS. Warming under adequate soil moisture (eT) significantly increased LDM by 25% but reduced the forage quality, increasing the lignin content and reducing starch, CP and digestibility. The combined wSeT treatment reduced A, gs , Vcmax and the forage quality. When compared to control, the lignin content in leaves increased by 43, 28 and 17% in wS, eT and wSeT, respectively, causing a significant reduction in IVDMD. We concluded that despite physiological mechanisms to acclimate to warming, both warming and water deficit will impair the quality and digestibility of C4 tropical pastures.

journal_name

Physiol Plant

journal_title

Physiologia plantarum

authors

Habermann E,Dias de Oliveira EA,Contin DR,Delvecchio G,Viciedo DO,de Moraes MA,de Mello Prado R,de Pinho Costa KA,Braga MR,Martinez CA

doi

10.1111/ppl.12891

subject

Has Abstract

pub_date

2019-02-01 00:00:00

pages

383-402

issue

eissn

0031-9317

issn

1399-3054

journal_volume

165

pub_type

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Warming and water deficit impact leaf photosynthesis and decrease forage quality and digestibility of a C4 tropical grass.