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Dundee, United Kingdom

Berry P.,ADAS High Mowthorpe | Teakle G.,University of Warwick | Foulkes J.,University of Nottingham | White P.,SCRI | Spink J.,ADAS Rosemaund
Acta Horticulturae | Year: 2010

Oilseed rape has a high requirement for nitrogen (N) fertiliser relative to its seed yield. This paper uses published and unpublished work to explore the extent to which the N use efficiency (seed yield + N supply) of oilseed rape could be improved without reducing seed yield. It was estimated that if the concentration of N in the stem and pod wall at crop maturity could be reduced from 1.0 to 0.6%, the root length density increased to 1 cm/cm to 100 cm soil depth and the post flowering N uptake increased by 20 kg N/ha then the fertiliser requirement could be reduced from 191 to 142 kg N/ha and the N use efficiency could be increased from 15.2 to 22.4 kg of seed dry matter per kg N. Genetic variation was found for all of the traits that were estimated to be important for N use efficiency. This indicates that there is significant scope for plant breeders to reduce N use efficiency in oilseed rape.


Revathi B.K.,Queen Marys College | Reuben Jonathan D.,Madras Christian College | Kalai Sevi K.,SCRI | Dhanalakshmi K.,Anna Siddha Medical College | Usha G.,Queen Marys College
Acta Crystallographica Section E: Crystallographic Communications | Year: 2015

In the title compound, 0.75C12H14ClNO2·0.25C12H14ClNO, which is an adduct comprising 0.75 4-hydroxypiperidin-1-yl or 0.25 4-piperidin-1-yl substituents on a common (4-chlorophenyl)methanone component; the dihedral angles between the benzene ring and the two piperidine rings are 51.6 (3) and 89.5 (7)°, respectively. The hydroxypiperidine ring is in a bisectional oriention (bi) with the phenyl ring. In the crystal, intermolecular O - H⋯O hydrogen bonds between the hydroxypiperidine group and the keto O atom lead to the formation of chains extending along the c- axis direction.


Revathi B.K.,Queen Marys College | Reuben Jonathan D.,Madras Christian College | Kalai Sevi K.,SCRI | Dhanalakshmi K.,Anna Siddha Medical College | Usha G.,Queen Marys College
Acta Crystallographica Section E: Crystallographic Communications | Year: 2015

In the title compound, C13H17NO2, the dihedral angle between the planes of the piperidine and benzene rings is 51.7 (2)°. The bond-angle sum around the N atom [359.8 (3)°] indicates sp 2 hybridization of the atom. In the crystal, O - H⋯O hydrogen bonds link the molecules, forming chains along [001].


Revathi B.K.,Queen Marys College | Reuben Jonathan D.,Madras Christian College | Kalai Sevi K.,SCRI | Dhanalakshmi K.,Anna Siddha Medical College | Usha G.,Queen Marys College
Acta Crystallographica Section E: Crystallographic Communications | Year: 2015

The title compound, C13H16ClNO2, crystallized with two independent molecules in the asymmetric unit (A and B). The piperidinol ring in molecule B is disordered over two positions with a site occupancy ratio of 0.667(5):0.333(5). In both molecules these rings have a chair conformation, including the minor component in molecule B. Their mean planes are inclined to the benzene ring by 45.57(13)° in molecule A, and by 50.5(4)° for the major component of the piperidine ring in molecule B. In the crystal, the individual molecules are linked by O - H⋯O hydrogen bonds, forming chains of A and B molecules along the [100] direction. The chains are interlinked by C - H⋯O hydrogen bonds, forming ribbons. © 2015.


Revathi B.K.,Queen Marys College | Reuben Jonathan D.,Madras Christian College | Kalai Sevi K.,SCRI | Dhanalakshmi K.,Anna Siddha Medical College | Usha G.,Queen Marys College
Acta Crystallographica Section E: Crystallographic Communications | Year: 2015

The title compound, C13H14NO2F3, crystallises with two molecules, A and B, in the asymmetric unit, with similar conformations. The dihedral angles between the piperidine and phenyl rings are 83.76(2) and 75.23(2)° in molecules A and B, respectively. The bond-angle sums around the N atoms [359.1 and 359.7° for molecules A and B, respectively] indicate sp 2 hybridization for these atoms. In the crystal, O - H⋯O hydrogen bonds link the molecules into separate [100] chains of A and B molecules. The chains are cross-linked by C - H⋯O interactions, generating alternating (001) sheets of A and B molecules. © 2015.

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