Garcez Neto, A. F.

Garcia, R.

Gobbi, K. F.

Pereira, O. G.

Rocha, G. C.

Ventrella, M. C.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Morphological and Anatomical Characteristics of Forage Peanut under Shade K. F. Gobbi Federal University of Viçosa, Brazil R. Garcia Federal University of Viçosa, Brazil A. F. Garcez Neto Federal University of Viçosa, Brazil M. C. Ventrella Federal University of Viçosa, Brazil O. G. Pereira Federal University of Viçosa, Brazil See next page for additional authors Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/10-1/17 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. Presenter Information K. F. Gobbi, R. Garcia, A. F. Garcez Neto, M. C. Ventrella, O. G. Pereira, and G. C. Rocha This event is available at UKnowledge: https://uknowledge.uky.edu/igc/21/10-1/17 瞯 ]204　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　Grasslands/Rangelands Production Systems——— Integration of Crops , Forage and Forest SystemsMorphological and anatomical characteristics of forage peanut under shadeGobbi , K .F . , Garcia , R . , Garcez Neto , A .F . , V entrella , M .C . , Pereira , O .G . , Rocha , G .C .Federal University o f V i毕osa , M inas Gerais , B raz il . E‐mail : kfgobbi＠ v icosa .ufv .brKey words : Arachis pintoi ,leaf tissues ,leaf stem ratio ,specific leaf areaIntroduction Forage peanut ( A rachis p intoi cv . Amarillo ) is a stoloniferous legume of central Brazil . Because of its shadetolerance , very high quality and high persistence under grazing , it has been suggested that forage peanut could be used insilvopastoral systems ( Kretschmer & Pitman , ２００１ ) . This work was carried out to evaluate changes in leaf anatomy andmorphological characteristics of forage peanut under shade and its acclimation to low light environment .Material and methods The study was located at the Federal University of Vi毕osa , Brazil ( ２０°４５′４０″ S and ４２°５１′４０″ W) fromDecember ２００５ to May ２００６ . The statistical design was a randomized complete block with three replicates . T reatmentsconsisted of three levels of artificial shade ( black shade cloth) : ０％ ( full sunlight) , ５０％ and ７０％ of shade .Forage peanut was sown in plots of ４ m２ , at seeding rate of ２０ kg / ha , and after seeds germination shade structures weremounted on the plots . When the sward light interception reached ９５％ of photosynthetically active radiation , plants wereharvested at ３ cm above ground level from ０ .６０ m × ０ .４０ m quadrats , and samples prepared to morphological and anatomicalevaluations . Analysis of variance and regression of data were performed using the SAS software .Results and discussion Mean petiole length , leaf area per leaflet and specific leaf area ( SLA ) increased linearly with shading( Table １) . Longer petioles might provide better spatial arrangement of leaves to intercept light more efficiently ( Lambers etal . , １９９８) . In spite of SLA increase , the leaf thickness was not affected by treatments . Plants that tolerate shade investrelatively more of the products of photosynthesis to increase leaf area and maximize capture of light . Moreover , their leafthickness is reduced to a smaller extent than it is in obligate sun plants submitted to shade ( Lambers et al . , １９９８) .Except for a linear increase in intercellular spaces under increased shading ( Table １ ) , percentage of leaf cross‐sectional areaoccupied by component tissues was similar for all the treatments . Once variation in SLA can be due to variation in leaf thicknessor in leaf density (Witkowski & Lamont , １９９１ ) , and leaf thickness of forage peanut was not altered ( P ＞ ０ .０５ ) , change inSLA is probably related to greater proportion of intercellular spaces and smaller leaf density under shade . The effect of shade onleaf : stem ratio was not significant ( P ＞ ０ .０５ ) for forage peanut , likely due to morphological adjustment found between leafarea and petiole length .Table 1 Morphological and anatomical characteristics o f f orage peanut under shade . ( Signi f icant : 倡倡倡 0 ,1％ ; 倡倡 1％ ) .VariablesShade ( ％ )0 儋50 670 �RegressionPetiole length ( mm) ３８ 妹.０ ５１  .０ ５６ T.２ Y ＝ ３８ 殚.０４７９ ＋ ０ .２５９４倡倡倡 x ; r２ ＝ ０ ．９４Leaf area/ leaflet ( cm２ ) ４ �.４ ６ 趑.２ ６ =.９ Y ＝ ４ 换.３７１９ ＋ ０ .０３６２倡倡倡 x ; r２ ＝ ０ ．９０SLA ( cm２ g‐１ ) ２１４ 谮.５ ２５９ ".５ ２７７ k.５ Y ＝ ２１４  .５１３１ ＋ ０ .８９９３倡倡倡 x ; r２ ＝ ０ ．９９Intercellular spaces ( ％ ) ６ �.８ １０  .７ １２ T.２ Y ＝ ６ 换.７８５３ ＋ ０ .０７７３倡倡 x ; r２ ＝ ０ ．８４Conclusions Forage peanut showed anatomical and morphological changes that confirmed its acclimation to shade . This foragelegume has a good potential as a component of silvopastoral systems .ReferencesKretschmer , A .E . , Pitman , W .D . , ２００１ . Germplasm resources of tropical forage legumes . In : Sotomayor‐Ríos ,A . ,Pitman , W .D . T ropical forage plants : development and use . Boca Raton : CRC Press , ４１‐５７ .Lambers , H . , Chapim III , F .S . , Pons , T .L . , １９９８ . Plant physiological ecology . New York : S p ringer . １９９８ . ３１７‐３２３ .Witkowski , E .T .F . ; Lamont , B .B . , １９９１ . Leaf specific mass confounds leaf density and thickness . Oecologia ８８ , ４８６‐４９３ .

Morphological and Anatomical Characteristics of Forage Peanut under Shade

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=3186&amp;context=igc

Morphological and Anatomical Characteristics of Forage Peanut under Shade

Abstract

Similar works

Full text

Available Versions

University of Kentucky