Leaf senescence and the profile of expanded leaf area in maize (Zea mays L.)
Tesis para obtener el grado de Doctor of Philosophy, de la University of Guelph, en 2002.
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| Formato: | info:ar-repo/semantics/tesis doctoral |
| Lenguaje: | Inglés |
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University of Guelph
2022
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| Acceso en línea: | http://hdl.handle.net/20.500.12123/12854 https://atrium.lib.uoguelph.ca/xmlui/handle/10214/24779 |
| _version_ | 1855036834467282944 |
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| author | Valentinuz, Oscar Rodolfo |
| author2 | Tollenaar, M. (director) |
| author_browse | Tollenaar, M. (director) Valentinuz, Oscar Rodolfo |
| author_facet | Tollenaar, M. (director) Valentinuz, Oscar Rodolfo |
| author_sort | Valentinuz, Oscar Rodolfo |
| collection | INTA Digital |
| description | Tesis para obtener el grado de Doctor of Philosophy, de la University of Guelph, en 2002. |
| format | info:ar-repo/semantics/tesis doctoral |
| id | INTA12854 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | University of Guelph |
| publisherStr | University of Guelph |
| record_format | dspace |
| spelling | INTA128542022-09-12T14:34:42Z Leaf senescence and the profile of expanded leaf area in maize (Zea mays L.) Valentinuz, Oscar Rodolfo Tollenaar, M. (director) Maíz Hojas Avejentamiento Zea mays Superficie Foliar Maize Leaves Senescence Leaf Area Senescencia Tesis para obtener el grado de Doctor of Philosophy, de la University of Guelph, en 2002. Leaf senescence is a major factor affecting light interception and dry matter accumulation during the grain-filling period. Reduced leaf senescence has been associated with maize yield genetic improvement. The objectives of this study were (i) to quantify maize senescence in terms of visual and functional symptoms in older and newer hybrids, and (ii) to examine the area-per-leaf profile in maize plants grown under a range of environments, agronomic practices and hybrids. Greater green leaf area throughout the grain-filling period in newer compared to older hybrids was the result of a greater leaf area index at silking and a delayed onset of visual leaf senescence. In addition, functional symptoms of leaf senescence (i.e., a decline in carbon exchange rate, stomatal conductance and chlorophyll fluorescence) were apparent in leaves that stayed green during later phases of the grain filling period. A bell-shape function proved to be a robust mean of quantifying the vertical leaf area distribution in maize. Variations due to year, nitrogen, plant density, hybrid, and row spacing on total leaf area could be quantified by measuring their effects on the area and position of the largest leaf. Overall, this study suggests that further advances in maize yield improvement will likely occur by combining 'stay green' with the maintenance of high photosynthesis through the season rather than extending green leaf area duration 'per se'. Furthermore, the study demonstrates that the profile of area per leaf profile of maize is conservative trait that could be exploited to make more rapid and precise estimations of both leaf area and senescence. EEA Paraná Fil: Valentinuz, Oscar. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Paraná; Argentina 2022-09-12T14:31:27Z 2022-09-12T14:31:27Z 2002-08 info:ar-repo/semantics/tesis doctoral info:eu-repo/semantics/doctoralThesis info:eu-repo/semantics/acceptedVersion http://hdl.handle.net/20.500.12123/12854 https://atrium.lib.uoguelph.ca/xmlui/handle/10214/24779 eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf University of Guelph |
| spellingShingle | Maíz Hojas Avejentamiento Zea mays Superficie Foliar Maize Leaves Senescence Leaf Area Senescencia Valentinuz, Oscar Rodolfo Leaf senescence and the profile of expanded leaf area in maize (Zea mays L.) |
| title | Leaf senescence and the profile of expanded leaf area in maize (Zea mays L.) |
| title_full | Leaf senescence and the profile of expanded leaf area in maize (Zea mays L.) |
| title_fullStr | Leaf senescence and the profile of expanded leaf area in maize (Zea mays L.) |
| title_full_unstemmed | Leaf senescence and the profile of expanded leaf area in maize (Zea mays L.) |
| title_short | Leaf senescence and the profile of expanded leaf area in maize (Zea mays L.) |
| title_sort | leaf senescence and the profile of expanded leaf area in maize zea mays l |
| topic | Maíz Hojas Avejentamiento Zea mays Superficie Foliar Maize Leaves Senescence Leaf Area Senescencia |
| url | http://hdl.handle.net/20.500.12123/12854 https://atrium.lib.uoguelph.ca/xmlui/handle/10214/24779 |
| work_keys_str_mv | AT valentinuzoscarrodolfo leafsenescenceandtheprofileofexpandedleafareainmaizezeamaysl |