Abstract: A genetically engineered land plant that expresses a protein that has homology to a plant invertase inhibitor and/or a pectin methylesterase inhibitor and that increases seed yield with increased expression (“an ISY protein”) is disclosed. The plant comprises a modified gene for the ISY protein. The ISY protein comprises one or more of an ISY protein of Camelina sativa comprising SEQ ID NO: 2 or a fragment, Camelina sativa homolog, or ortholog thereof. The modified gene comprises a promoter and a nucleic acid sequence encoding the ISY protein. The promoter is non-cognate with respect to the nucleic acid sequence encoding the ISY protein. The modified gene is configured such that transcription of the nucleic acid sequence is initiated from the promoter and results in expression of the ISY protein. A genetically engineered land plant that expresses an RNA that increases seed yield with increased expression also is disclosed.

Abstract: A genetically engineered land plant that expresses a protein that has homology to a plant invertase inhibitor and/or a pectin methylesterase inhibitor and that increases seed yield with increased expression (“an ISY protein”) is disclosed. The plant comprises a modified gene for the ISY protein. The ISY protein comprises one or more of an ISY protein of Camelina sativa comprising SEQ ID NO: 2 or a fragment, Camelina sativa homolog, or ortholog thereof. The modified gene comprises a promoter and a nucleic acid sequence encoding the ISY protein. The promoter is non-cognate with respect to the nucleic acid sequence encoding the ISY protein. The modified gene is configured such that transcription of the nucleic acid sequence is initiated from the promoter and results in expression of the ISY protein. A genetically engineered land plant that expresses an RNA that increases seed yield with increased expression also is disclosed.

Abstract: A genetically engineered land plant that expresses a protein that has homology to a plant invertase inhibitor and/or a pectin methylesterase inhibitor and that increases seed yield with increased expression (“an ISY protein”) is disclosed. The plant comprises a modified gene for the ISY protein. The ISY protein comprises one or more of an ISY protein of Camelina sativa comprising SEQ ID NO: 2 or a fragment, Camelina sativa homolog, or ortholog thereof. The modified gene comprises a promoter and a nucleic acid sequence encoding the ISY protein. The promoter is non-cognate with respect to the nucleic acid sequence encoding the ISY protein. The modified gene is configured such that transcription of the nucleic acid sequence is initiated from the promoter and results in expression of the ISY protein. A genetically engineered land plant that expresses an RNA that increases seed yield with increased expression also is disclosed.

Abstract: Plant transcription factors and genes encoding the transcription factors are disclosed. Methods to enhance characteristics in a plant by downregulating the genes encoding the transcription factors also are disclosed. The enhanced characteristics can include higher photosynthesis rates, reduced photorespiration rates, higher biomass yield or content, higher seed yield, improved harvest index, higher oil content, improved nutritional composition, improved nitrogen use efficiency, drought resistance, flood resistance, disease resistance, faster seed germination and plant emergence, improved seedling vigor, salt tolerance, higher CO2 assimilation rate, and lower transpiration rate. Modified plants in which the genes encoding the transcription factors are downregulated also are disclosed. Compositions of the invention comprise polynucleotide sequences, polypeptide sequences, variants, orthologs, and fragments thereof.