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Interactions between irradiance levels (5–40 μmol·m -2 ·s -1 ) and iron chelate sources (FeEDTA and FeEDDHA) were observed for  Carica papaya  shoot tip cultures during both the  establishment and proliferation  stages of microculture. Reduced levels of irradiance (5 μmol·m -2 ·s -1 ) favored shoot tip establishment regardless of the source or level of iron. However, the highest percentage of successful explant establishment (100%), and significantly greater leaf length (1.16 cm; over double the size attained in any other treatment), resulted when a low concentration of FeEDTA alone was used at low irradiance. During the subsequent shoot proliferation stage, however, higher irradiance levels (30 and 40 μmol·m -2 ·s -1 ) were required, and FeEDTA failed to support culture growth when used as the sole iron source. The highest multiplication rates (3.6 shoots per explant) and leaf chlorophyll concentrations (0.22 mg/g fresh mass), and significantly improved shoot quality were achieved at 30 μmol·m -2 ·s -1  irradiance when both iron chelate formulations were combined (each at a 100 μM concentration) in the proliferation medium. Chemical names used: benzylamino purine (BA); ferric disodium ethylenediamine tetraacetate or FeNa 2 EDTA (FeEDTA); ferric monosodium ethylenediamine di(o-hydroxyphenylacetate), (FeNaEDDHA) or Sequestrene 138Fe (FeEDDHA); indoleacetic acid (IAA); 1-naphthaleneacetic acid (NAA).

Interactions of Irradiance Level and Iron Chelate Source During Shoot Tip Culture of Carica papaya L.