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🧬 Jute and Fiber Crops — Breeding

Breeding of Corchorus species for fibre quality and retted fibre yield along with improvement of other kharif fibre crops.

Jute breeding targets both productivity and fibre processing quality because market value depends heavily on retted fibre traits. This lesson covers Corchorus species improvement and allied kharif fibre crop directions.

Jute — Origin and Importance

Jute is the second most important natural fibre after cotton and is called the "Golden Fibre" due to its lustrous appearance. Two species are commercially cultivated:

  • Corchorus capsularis (White jute, 2n = 14) — originates from Indo-Burma region; tolerant of waterlogging; capsule is round and indehiscent.
  • Corchorus olitorius (Tossa jute, 2n = 14) — originates from Africa; yields superior fibre quality with higher lustre and strength; capsule is long and cylindrical.

India and Bangladesh together account for over 95% of global jute production. West Bengal, Bihar, Assam, and Odisha are the major producing states in India. The Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, coordinates jute research.

Jute Breeding Objectives

  1. High retted fibre yield — fibre is extracted through retting (microbial decomposition of pectins binding fibre to the stem). Breeding for thicker, taller stems with higher fibre-to-core ratio is essential.
  2. Fibre quality — fineness (tex value), strength, lustre, and uniformity. Fine fibre commands a premium for textile use.
  3. Disease resistance — major diseases include:
    • Stem rot (Macrophomina phaseolina) — devastating in C. capsularis.
    • Root rot (Rhizoctonia solani) — important in waterlogged areas.
  4. Insect resistance — yellow mite (Polyphagotarsonemus latus), stem weevil, and Bihar hairy caterpillar.
  5. Premature flowering resistance — early flowering reduces fibre yield and quality. Photo-insensitive cultivars that do not flower prematurely when sown early are preferred.
  6. Low lignin content — facilitates easier retting and produces finer fibre.

Breeding Methods

Jute is a self-pollinated crop with less than 5% outcrossing. Standard methods include:

  • Hybridization and pedigree selection — crosses between C. capsularis and C. olitorius face strong crossability barriers. Intraspecific hybridization is routine.
  • Mutation breeding — several improved lines have been developed using gamma irradiation.
  • Interspecific hybridization — attempted using embryo rescue and colchicine treatment to combine the waterlogging tolerance of capsularis with the fibre quality of olitorius.

Notable varieties include JRC 212, JRC 532 (capsularis), JRO 524 (Naveen), and JRO 204 (Suren) (olitorius).

Other Kharif Fiber Crops

Mesta (Roselle and Kenaf)

  • Hibiscus sabdariffa (Roselle, 2n = 36) and H. cannabinus (Kenaf, 2n = 36) are secondary jute substitutes.
  • Breeding focuses on fibre yield, fineness, and tolerance to foot rot and stem rot.
  • Varieties: AMV 5 (roselle), MT 150 (kenaf).

Sunnhemp

  • Crotalaria juncea (2n = 16) — used for fibre and green manure. Breeding for reduced Crotalaria alkaloid content and high biomass.

Summary Cheat Sheet

Quick Recall Points\n- Main cultivated jute species: C. capsularis and C. olitorius (both 2n = 14).\n- Priority traits: retted fibre yield, fineness, lustre, and reduced premature flowering.\n- Interspecific transfer is constrained by crossability barriers.\n\n### Exam Traps\n- High biomass alone is insufficient if fibre quality and retting behavior are poor.\n- Species origin and capsule traits are commonly mixed up in exams.

References

2 sources • [1] [2]

[1]

ICAR eCourse: GPBR 213 Crop Improvement-I (Kharif Crops)

Book
[2]

ICAR Crop-specific research bulletins (IIRR, IIMR, IIMR Sorghum, ICRISAT, CICR, SBI, CRIJAF)

Website

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