Knowledge Center Catalog

Screening genetic variation for photosynthetic capacity and efficiency in wheat, (Record no. 60266)

MARC details
000 -LEADER
fixed length control field 04150nam a22002657a 4500
001 - CONTROL NUMBER
control field 60266
003 - CONTROL NUMBER IDENTIFIER
control field MX-TxCIM
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20211006072251.0
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
fixed length control field 190319t2016 at ||||| |||| 00| 0 eng d
040 ## - CATALOGING SOURCE
Original cataloging agency MX-TxCIM
041 ## - LANGUAGE CODE
Language code of text/sound track or separate title eng
100 1# - MAIN ENTRY--PERSONAL NAME
9 (RLIN) 1906
Personal name Silva-Pérez, V.
245 ## - TITLE STATEMENT
Title Screening genetic variation for photosynthetic capacity and efficiency in wheat,
Statement of responsibility, etc. A thesis submitted for the degree of Doctor of Philosophy of The Australian National University by M.C. Viridiana Silva Pérez
260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT)
Place of publication, distribution, etc. Australia :
Name of publisher, distributor, etc. Australian National University ,
Date of publication, distribution, etc. 2016.
300 ## - PHYSICAL DESCRIPTION
Extent 189 p.
500 ## - GENERAL NOTE
General note OPEN ACCESS
520 ## - SUMMARY, ETC.
Summary, etc. The world population is rising, placing increasing demands on food production. One way to contribute to food security is by improving yields of staple crops like wheat. Yield can be calculated from the product of plant biomass and harvest index (the ratio of grain yield to above ground biomass). Since harvest index of wheat has already reached its maximum biological limit in some environments, attention is now focused on increasing crop biomass. Efficient interception of photosynthetically active radiation and effective photosynthetic sugar production underpin yield, however, little breeding has been done for photosynthetic performance. Exploiting existing genetic variation for important photosynthetic traits such as photosynthetic capacity (Pc) and photosynthetic efficiency (Peff) will help to improve wheat yield. CO2 assimilation rate, which is a commonly measured parameter for assessing photosynthetic performance, is found to vary across wheat genotypes. Two additionally important parameters are Rubisco activity (Vcmax) and electron transport rate (J). There is much less information reported regarding genetic variation of these two latter parameters because measurements of CO2 response curves with gas exchange used to derive Vcmax and J are slow and unsuitable for rapid screening of many genotypes in the field. The two main objectives of this project were firstly, to find out if there is genetic variation for these important photosynthetic traits in wheat, and secondly, to develop a rapid method for screening photosynthetic and leaf attributes in different wheat genotypes. To deal with variable leaf temperatures in the field and accurately estimate Vcmax and J, improved values for the temperature dependence of several Rubisco kinetic parameters were needed. These temperature-dependencies were derived from measurements made under controlled conditions. A method for rapidly estimating variation in Pc components Vcmax and J and in other photosynthetic traits was developed based on calibration of leaf reflectance spectra against photosynthetic parameters derived using conventional gas exchange, morphological (leaf mass per unit area, LMA) and chemical (nitrogen and chlorophyll per unit area) measurements of 76 wheat genotypes screened in several different environments. When observed data were compared against predictions from reflectance spectra, correlation coefficients (R2 values) of 0.62 for Vcmax25, 0.71 (J), 0.89 (LMA) and 0.93 (Narea), were obtained. Reflectance spectra from an additional 458 elite and landrace wheat genotypes were measured to further assess variation in photosynthetic traits. There were significant differences between wheat genotypes in Vcmax25 per unit N, which is a good measure of Peff. Environment presented interaction with genotypes for Pc and Peff when measurements performed in glasshouse & field or in Australia & Mexico were compared. In future, linking genotypic variation for photosynthetic traits to DNA-based genetic markers will permit even faster selection of genotypes in breeding. Reflectance spectra should be a good tool to accelerate identification and selection of wheat genotypes and detection of important genomic regions for photosynthetic capacity and efficiency in wheat.
546 ## - LANGUAGE NOTE
Language note Text in English
595 ## - COLLECTION
Collection Thesis Collection
650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM
9 (RLIN) 1913
Topical term or geographic name as entry element Photosynthesis
Source of heading or term AGROVOC
650 17 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element Wheat
Miscellaneous information AGROVOC
Source of heading or term
9 (RLIN) 1310
650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM
9 (RLIN) 1296
Topical term or geographic name as entry element Triticum aestivum
Source of heading or term AGROVOC
650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM
9 (RLIN) 7940
Topical term or geographic name as entry element Temperature
Source of heading or term AGROVOC
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Source of classification or shelving scheme Dewey Decimal Classification
Koha item type Thesis
Suppress in OPAC No
Holdings
Date last seen Total Checkouts Full call number Barcode Price effective from Koha item type Lost status Source of classification or shelving scheme Damaged status Not for loan Collection code Withdrawn status Home library Current library Date acquired
04/08/2019   040.08 SIL 635956 04/08/2019 Thesis Not Lost Dewey Decimal Classification     General Book Collection   CIMMYT Knowledge Center: John Woolston Library CIMMYT Knowledge Center: John Woolston Library 04/08/2019

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