Effect of mineral nutritional status on shoot-root partitioning of photoassimilates and cycling of mineral nutrients

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Marschner H., Kirkby E., Cakmak I.

JOURNAL OF EXPERIMENTAL BOTANY, cilt.47, ss.1255-1263, 1996 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 47
  • Basım Tarihi: 1996
  • Doi Numarası: 10.1093/jxb/47.special_issue.1255
  • Dergi Adı: JOURNAL OF EXPERIMENTAL BOTANY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1255-1263
  • Çukurova Üniversitesi Adresli: Hayır

Özet

Mineral nutrients taken up by the roots are, as a rule, transported in the xylem to the shoot, and photoassimilates transported in the phloem to the roots. According to the Thornley model of photosynthate partitioning, nutrient deficiencies should favour photosynthate partitioning to the roots. Examples are cited to show that this preferential partitioning is dependent on phloem mobility and hence on nutrient cycling from shoot to roots. Thus, root growth is enhanced under nitrogen and phosphorus deficiencies, but not under deficiencies of nutrients of low mobility in the phloem, such as calcium and boron. Enhanced root growth under nutrient deficiency relies on the import of both photosynthates and mineral nutrients.