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Protocols for Micropropagation of Woody Trees and Fruits

Protocols for Micropropagation of Woody Trees and Fruits

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PROPAGATION OF MONGOLIAN CHERRY AND NANKING CHERRY<br />

Table 1. Murashige <strong>and</strong> Skoog Minimal Organic (MSMO) medium (Murashige <strong>and</strong> Skoog, 1962).<br />

MS Macro Nutrients NH4NO3<br />

KNO3<br />

CaCl2 · 2H2O<br />

MgSO4 · 7H2O<br />

Compound Amount [mg l –1 ]<br />

KH2PO4<br />

MS Micro Nutrients H3BO3<br />

MnSO4 · H2O<br />

ZnSO4 · 7H2O<br />

KI<br />

Na2MoO4 · 2H2O<br />

CuSO4 · 5H2O<br />

CoCl2 · 6H2O<br />

Iron Sources FeSO4 · 7H2O<br />

Na2EDTA<br />

Vitamins Thiamine HCl<br />

Pyrodixin HCL<br />

Nicotinic acid<br />

1650<br />

1900<br />

440<br />

370<br />

170<br />

6.2<br />

16.9<br />

8.6<br />

0.8<br />

0.25<br />

0.025<br />

0.025<br />

27.8<br />

37.3<br />

0.4<br />

0.5<br />

0.5<br />

Organic constituents Inositol 100<br />

Sucrose Varies<br />

Agar Varies<br />

2.2.5. Shoot Regeneration <strong>and</strong> Maintenance<br />

As in other woody plant species, genetically uni<strong>for</strong>m plants <strong>of</strong> Mongolian <strong>and</strong><br />

Nanking cherry are obtained from cultures established from shoot tips, buds or<br />

meristems. Other organs <strong>and</strong> callus would provide a risk <strong>of</strong> inducing variability<br />

(Druart & Gruselle, 1986). Thus, suitable PGR combinations <strong>and</strong> concentrations<br />

have to be used to differentiate new axillary buds (rosettes) <strong>and</strong> to develop into<br />

shoots without callus <strong>for</strong>mation. In our work, MSMO media were supplemented<br />

with combinations <strong>of</strong> various PGRs <strong>for</strong> initiation <strong>and</strong> establishment <strong>of</strong> cultures. The<br />

optimal combinations <strong>for</strong> culture establishment <strong>and</strong> per<strong>for</strong>mance have been<br />

determined following a number <strong>of</strong> experiments <strong>and</strong> are presented in Table 2. The<br />

combination <strong>of</strong> IBA <strong>and</strong>/or NAA with 8.9 µM BA is the best <strong>for</strong> initiation <strong>of</strong> both<br />

Mongolian <strong>and</strong> Nanking cherry cultures. The number <strong>of</strong> rosettes produced on media<br />

with 8.9 µM BA is significantly higher than on media with 4.4 µM BA.<br />

Initially, one explant (dormant bud) was placed on medium to establish the<br />

culture. Following 4 weeks in culture, approx. 90% explants survived. Most <strong>of</strong> them<br />

produced a single rosette <strong>and</strong> a few produced two rosettes (out <strong>of</strong> 30 explants). For<br />

Mongolian cherry media supplemented with lower concentration <strong>of</strong> BA (4.4 µM)<br />

395

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