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Protocols for Micropropagation of Woody Trees and Fruits

Protocols for Micropropagation of Woody Trees and Fruits

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MICROGRAFTING IN GRAPEVINE 253<br />

Table 1. Commonly used nutrient media <strong>for</strong> multiplication <strong>of</strong> grapevine shoots.<br />

Sl # Medium Macro<br />

elements<br />

a.<br />

b.<br />

1 MS 1/2 1<br />

3 NN 1 1<br />

1 MS, Murashige & Skoog (1962) medium; 2 LM, Lloyd & McCown (1980) organics; 3 NN,<br />

Nitsch & Nitsch (1969) medium; 4 LS, Linsmaier & Skoog (1965) medium; 5 WPM, woody<br />

plant medium (Sigma catalogue, 1994); 6 B 5, Gamborg et al. (1968) medium; BAP, benzyl<br />

amino purine; IAA, indole-3-acetic acid; Ad. sul., adenine sulphate; NAA, naphthalene acetic<br />

acid; IBA, indole butyric acid.<br />

2.3. In Vitro Grafting<br />

Micro<br />

elements<br />

mg l –1<br />

Vitamins Growth<br />

adjuvant<br />

2 LM-1 +<br />

inositol-2<br />

BAP 0.5+IAA<br />

0.08<br />

4 LS-1 Thiamine 10 +<br />

Ad. sul. 40.53 +<br />

monobasic<br />

NaH 2PO4 218.4<br />

+ BAP 2.25 +<br />

NAA 0.09<br />

c.<br />

5<br />

WPM 1 1<br />

6<br />

B5-1 Cal. Pan. 2 +<br />

monobasic<br />

NaH2PO4 168<br />

+ BAP 2.25 +<br />

IBA 0.5<br />

30<br />

d. MS 1 1 1 BAP 0.5 + IAA<br />

0.2<br />

20<br />

e. MS 1/2 1/2 1 IAA 0.1 10<br />

Carbon<br />

source<br />

g l –1<br />

Reference<br />

30 Pathirana<br />

&<br />

McKenzie,<br />

2005<br />

2.3.1. Using Shoot Apices<br />

In vitro micrografting can be attempted using shoot apices (0.3 mm) as explants, <strong>of</strong><br />

the chosen rootstock <strong>and</strong> the scion to generate shoots on a large scale (Cantos et al.,<br />

1995). Once the rootstock culture is established as a rooted shoot, its top portion can<br />

be cut so that there is no nodal region left <strong>and</strong> a small cleft is made in the cut end.<br />

The shoot portion (bearing 3–4 buds) <strong>of</strong> the scion is sliced from the rest <strong>and</strong> inserted<br />

in the cleft <strong>of</strong> the rootstock. The entire set is again cultured in vitro on a medium that<br />

supports growth (Table 1). Bass et al. (1988) have used animal serum in the culture<br />

medium to facilitate the development <strong>of</strong> grapevine meristems (0.1 mm, 1–2 leaf<br />

primordial) <strong>and</strong> report an increase in the number <strong>of</strong> meristems developing into<br />

plantlets as well as in the rate <strong>of</strong> their in vitro differentiation. The healing <strong>of</strong> the<br />

callus occurs during the first 6 days <strong>and</strong> the establishment <strong>of</strong> vascular junction –<br />

between the 8 <strong>and</strong> 12th day after grafting. This is the critical period <strong>for</strong> successful<br />

micrografting <strong>and</strong> results in 60% survival <strong>of</strong> the micrografted plants (Cantos et al.,<br />

1995).<br />

20<br />

Mhatre<br />

et al., 2000

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