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Conversion of SO 2− 4 ‐S and Changes in Glucosinolate Content in Leaves of Rape Seedlings Transplanted
Author(s) -
Qinzheng Zhang,
Xiafua Lan,
Haifu Xi,
Xuequn Zhu,
Yinhua Liu
Publication year - 1991
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1991.tb00890.x
Subject(s) - glucosinolate , labelling , amino acid , chemistry , dry weight , seedling , botany , horticulture , food science , agronomy , biology , biochemistry , brassica
The conversion of SO 2‐ 4 ‐S and changes in content of S in various constituents in leaves of rape seedlings transplanted were investigated by using (NH 4 ) 2 35 SO 4 as a tracer to exploit formation and accumulation of glucosinolates in oilseed rape. Seedlings grown under sandy culture absorbed 35 SO 2‐ 4 which was added to the cultural solution and incorporated into amino acids, glucosinolates and proteins rapidly. Distribution of extractable 35 S with 70 % methanol in glucosinolates in leaves declined with time from labelling, while those in amino acids rised correspondingly. Per cents of 35 S incorporated into bound form in total 35 S increased linearly and those of 35 S into glucosinolates and amino acids decreased with time within five days from labelling. After that the relative amounts of 3S S in three constituents was basically constant. Content on dry weight basis of labelled glucosinolates and amino acids expressed as μmol S/g.d.w. increased linearly with time from labelling with absorption of 35 SO 2‐ 4 from soil by the seedlings under soil culture. Compared with seedlings grown under sandy culture, more 35 S was incorporated into glucosinolates in leaves of seedlings grown under soil culture.