Factors affecting kernel yield in maize

1-4 genes, were investigated by examining the impact of knock-out mutations on kernel yield. GS gene expression was impaired in the mutants, resulting in reduced levels of GS1 protein and activity. The gln1-4 phenotype displayed reduced kernel size whereas gln1-3 had reduced kernel number, and both phenotypes were evident in the gln1-3 gln1-4 double mutant. Shoot biomass production at maturity was not affected in either the single mutants or double mutants, suggesting that both gene products play a specific role in grain production. Levels of asparagine increased in the leaves of the mutants during grain filling, most likely as a mechanism for circumventing toxic ammonium buildup resulting from abnormally low GS1 activity. Phloem sap analysis revealed that, unlike glutamine, asparagine is not efficiently transported to developing maize kernels, which could account for the reduced kernel production in the mutants. Constitutive overexpression of Gln1-3 in maize leaves resulted in a 30% increase in kernel number relative to wild type, providing further evidence that GS1 plays a major role in kernel yield.

Some of the major cereals, such as maize, sorghum, and sugar cane, exhibit C4 photosynthesis, which enhances the efficiency of photosynthesis at high temperature (most C4 plants originated in tropical climates). In standard C3 photosynthesis (present in rice, wheat, and most temperate crop plants), CO2 entering the leaf is converted to a 3-carbon compound via the C3 pathway, utilizing energy derived from the light reactions of photosynthesis. In plants that have C4 photosynthesis, the C3 pathway enzymes are localized in specialized bundle sheath cells which surround the vascular tissue in the interior of the leaf. CO2 entering mesophyll cells at the leaf surface initially is converted to a 4-carbon compound, which is shuttled into the bundle sheath cells and then decarboxylated to release CO2. CO2 released into bundle sheath cells then enters the standard

Contact: Nancy Eckardt
American Society of Plant Biologists

Page: 1 2 3

Related biology news :

1. Impressive new Impact Factors for BioMed Centrals open-access journals
2. Creating new life forms that may help eradicate cancer affecting women
3. Kansas State study finds new vaccine effective against deadly viral disease affecting swine
4. UMass Lowell research shows benefits of apple juice on neurotransmitter affecting memory
5. CHAVI announces international search for genes affecting HIV response
6. More than drought affecting wheat yields
7. Lost forest yields several new species
8. Natures secrets yield new adhesive material
9. Sequencing method yields fuller picture
10. Modified mushrooms may yield human drugs
11. St. Jude study yields secrets of chromosome movement

Post Your Comments:

(Date:6/1/2016)... 2016 Favorable Government Initiatives Coupled ... Criminal Identification to Boost Global Biometrics System Market Through ... Research report, " Global Biometrics Market By Type, ... Opportunities, 2011 - 2021", the global biometrics market is ... account of growing security concerns across various end use ...
(Date:5/9/2016)... DUBAI , UAE, May 9, 2016 ... choice when it comes to expanding freedom for high ... Even in today,s globally connected world, there ... online conferencing system could ever duplicate sealing your deal ... are obtaining second passports by taking advantage of citizenship ...
(Date:4/26/2016)... DUBLIN , April 27, 2016 ... of the  "Global Multi-modal Biometrics Market 2016-2020"  report ... ) , The analysts forecast ... a CAGR of 15.49% during the period 2016-2020.  ... a number of sectors such as the healthcare, ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... Wausau, WI (PRWEB) , ... June 23, 2016 ... ... probiotic supplements, is pleased to announce the launch of their brand, UP4™ Probiotics, ... supplements for over 35 years, is proud to add Target to its list ...
(Date:6/23/2016)... 23, 2016 Houston Methodist Willowbrook Hospital ... Sports Association to serve as their official health ... Methodist Willowbrook will provide sponsorship support, athletic training ... association coaches, volunteers, athletes and families. ... Sports Association and to bring Houston Methodist quality ...
(Date:6/23/2016)... SAN FRANCISCO , June 23, 2016   ... it has secured $1 million in debt financing from ... to ramp up automation and to advance its drug ... for its new facility. "SVB has been ... goes beyond the services a traditional bank would provide," ...
(Date:6/23/2016)... Apellis Pharmaceuticals, Inc. today announced positive ... its complement C3 inhibitor, APL-2. The trials were ... studies designed to assess the safety, tolerability, pharmacokinetics ... healthy adult volunteers. Forty subjects were ... dose (ranging from 45 to 1,440mg) or repeated ...
Breaking Biology Technology:
Cached News: