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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Alterações fisiológicas de gramíneas tropicais submetidas a diferentes níveis de irradiância / Physiological changes of tropical grasses submitted at different levels of irradiance

Silva, Laudson Ferreira da 24 March 2017 (has links)
Submitted by JÚLIO HEBER SILVA (julioheber@yahoo.com.br) on 2017-04-19T20:01:35Z No. of bitstreams: 2 Tese - Laudson Ferreira da Silva - 2017.pdf: 1543389 bytes, checksum: bb788555db9f07968a84048025a2232d (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-04-20T14:42:18Z (GMT) No. of bitstreams: 2 Tese - Laudson Ferreira da Silva - 2017.pdf: 1543389 bytes, checksum: bb788555db9f07968a84048025a2232d (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2017-04-20T14:42:18Z (GMT). No. of bitstreams: 2 Tese - Laudson Ferreira da Silva - 2017.pdf: 1543389 bytes, checksum: bb788555db9f07968a84048025a2232d (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-03-24 / Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG / This work aimed to analyze the growth and the partition of assimilates in plants such as Urochloa brizantha cv. Marandu, U. decumbens cv. Basilisk, Panicum maximum cv. Massai and Cynodon dactylon cv. Vaquero, submitted to three levels of luminosity (100, 50 and 25%). The plants were collected at regular intervals of seven days, from the 20th day after the emergency (DAE), to seventy six DAE, with a last collection of ninety DAE. The height (H), tiller number (TN), root dry matter (RDM), stem dry matter (SDM), leaf dry matter (LDM), leaf mass ratio (LMR), ratio between root dry matter and aerial part of the dry matter (RRAP), total dry matter (TDM), specific leaf area (SLA), leaf area ratio (LAR), liquid assimilation rate (LIAR), relative growth rate (RGR), leaf area index (LAI), crop growth rate (CGR), chlorophyll and carotenoids content. The analyzed species grew and developed in an environment with 50% of light equivalent to plants grown in full sun, since there were no significant differences regarding H, RDM, SDM, LDMC, TDM. Similarly, there was no significant difference in LIAR, RGR and CGR in the species, except in P. maximum, which presented such physiological indicators of growth higher than plants grown in the full sun. LAI was also equivalent, except for U. brizantha and U. decumbens, which presented higher index than plants in full sun. The luminosity level of 25% negatively affected the growth and development of the species, except in P. maximum, whose results were equivalent to those presented in full sun and 50% of light. Species demonstrate tolerance to light restriction and, therefore, production potential to be used in silvopasture and agrosilvopasture production systems. / O presente trabalho teve como objetivo analisar o crescimento e a partição de assimilados em plantas de Urochloa brizantha cv. Marandu, U. decumbens cv. Basilisk, Panicum maximum cv. Massai e Cynodon dactylon cv. Vaquero, submetidas a três níveis de luminosidade (100, 50 e 25%). As plantas foram coletadas em intervalos regulares de sete dias, a partir do vigésimo dia após a emergência (DAE), até setenta e seis DAE, sendo efetuada uma última coleta com noventa DAE. Avaliaram-se a altura (H), número de perfilhos (NP), matéria seca da raiz (MSR), matéria seca do colmo (MSC), matéria seca foliar (MSF), razão da massa foliar (RMF), razão entre a matéria seca radicular e a matéria seca da parte aérea (RRPA), matéria seca total (MST), área foliar específica (AFE), razão de área foliar (RAF), taxa assimilatória líquida (TAL), taxa de crescimento relativo (TCR), índice de área foliar (IAF), taxa de crescimento da cultura (TCC), teores de clorofilas e carotenoides. As espécies analisadas cresceram e desenvolveram-se em ambiente com 50% de luz de modo equivalente às plantas cultivadas em pleno sol, uma vez que não houve diferenças significativas quanto a H, MSR, MSC, MSF, MST. De modo similar, não houve diferença significativa na TAL, TCR e TCC nas espécies, exceto, em P. maximum, que apresentou tais indicadores fisiológicos do crescimento superiores às plantas cultivadas em pleno sol. O IAF foi igualmente equivalente, exceto, para U. brizantha e U. decumbens, que apresentou índice superior às plantas em pleno sol. O nível de luminosidade de 25% afetou negativamente o crescimento e desenvolvimento das espécies, exceto, em P. maximum, cujo resultado foi equivalente aos apresentados em pleno sol e 50% de luz. As espécies demonstram tolerância à restrição luminosa e, portanto, potencial de produção para serem utilizadas nos sistemas de produção silvipastoris e agrossilvipastoris.

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